Top 15 Network Security Engineer Interview Questions | Upwork

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1. Can you explain the CIA triad and its importance in network security?

Purpose: This question evaluates a candidate's foundational knowledge of information security fundamentals and their ability to clearly explain core security policies to stakeholders.

Answer: "The CIA triad—Confidentiality, Integrity, and Availability—forms the foundation of information security. Confidentiality makes sensitive data accessible only to authorized users, integrity maintains data accuracy and prevents unauthorized modifications, and availability keeps systems operational and accessible when needed."

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2. How do you handle DDoS attacks and other forms of denial of service?

Purpose: This question assesses the candidate's incident response capabilities and practical experience in protecting networks against sophisticated cyberattacks.

Answer: "First, I identify the attack signature through intrusion detection systems and monitor network traffic patterns. Then, I implement immediate mitigation strategies like traffic filtering and TCP/IP blocking of suspicious IP addresses. For long-term prevention, I recommend implementing a robust security system with proper network segmentation and DDoS-specific protection tools."

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3. What strategies do you use to configure and manage firewalls in a Cisco environment?

Purpose: This question examines the candidate's hands-on experience with essential network security tools and their problem-solving skills in real-world scenarios.

Answer: "My approach includes implementing rule-based access control lists, regularly auditing firewall rules, monitoring network traffic patterns, and maintaining detailed documentation of all changes. I also ensure proper segmentation between network zones and implement intrusion prevention systems for additional protection."

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4. How do you implement and secure VPN solutions for network access across various devices?

Purpose: This question helps assess the candidate's expertise in securing remote access for laptops, mobile apps, and other endpoints while maintaining strong security protocols.

Answer: "I implement VPNs using strong authentication methods, encryption protocols like SSL/TLS, and careful access control policies. I regularly perform security audits, monitor network traffic for suspicious activity, and maintain updated security protocols while providing smooth remote access for authorized users."

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5. Describe your experience with security protocols and network protocols in relation to the OSI model.

Purpose: This question examines the candidate's understanding of network architecture from the application layer through the entire OSI stack.

Answer: "I work extensively with TCP/IP, UDP, and DNS protocols while implementing security measures like IPSec. I ensure proper configuration of transport layer security, maintain updated security protocols, and regularly monitor network traffic for potential security threats."

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6. What's your approach to securing network protocols and preventing malware?

Purpose: This question evaluates the candidate's experience with addressing both common and sophisticated threats from hackers while maintaining strong security measures.

Answer: "I implement comprehensive SSL/TLS protocols across web applications and ensure proper certificate management. The process includes regular security audits of network protocols, monitoring for suspicious activity, and maintaining updated encryption standards while following security policies."

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7. How do you detect and prevent man-in-the-middle attacks while troubleshooting network issues?

Purpose: This question examines the candidate's ability to handle complex cybersecurity threats while maintaining system performance.

Answer: "I implement strong authentication mechanisms, ensure proper SSL/TLS configuration, and regularly monitor network traffic for unusual patterns. Additionally, I maintain strict security policies around certificate management and conduct regular vulnerability assessments to identify potential weaknesses."

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8. What steps do you take to protect against ransomware and data breaches?

Purpose: This question allows candidates to demonstrate their comprehensive knowledge of cybersecurity incident prevention and response.

Answer: "Protection involves multiple layers—implementing robust antivirus solutions, maintaining regular backups of sensitive data, segmenting networks to prevent lateral movement, and training users to recognize phishing attempts. I also develop comprehensive incident response plans for potential security breaches."

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9. Describe your experience with intrusion detection and prevention systems across Mac and Windows environments.

Purpose: This question evaluates the candidate's technical expertise with security tools across different operating systems.

Answer: "I configure IDS/IPS to monitor network traffic, detect suspicious activity, and automatically respond to potential threats. This includes setting up proper alerting mechanisms, regularly updating detection algorithms, and fine-tuning rules to minimize false positives while maintaining security."

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10. How do you handle access control and authentication for enterprise applications?

Purpose: This question explores the candidate's approach to securing various business apps while maintaining usability.

Answer: "I implement role-based access control, enforce strong password policies, and utilize multi-factor authentication where appropriate. Regular audits ensure proper authorization levels, and I maintain detailed logs of access attempts to detect potential security incidents."

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11. How do you approach network segmentation and routing in complex environments?

Purpose: This question assesses the candidate's ability to design and maintain secure network architectures while demonstrating problem-solving skills.

Answer: "I implement segmentation based on business needs, security requirements, and access control policies. This includes configuring routers with proper ACLs, establishing secure routing protocols, and monitoring network traffic between segments while ensuring optimal performance of the company's network."

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12. What's your process for conducting vulnerability assessments?

Purpose: This question evaluates how thoroughly candidates approach security testing across different platforms and devices, including laptops and mobile endpoints.

Answer: "I use a combination of automated security tools and manual testing to identify vulnerabilities across computer networks. The process includes scanning for outdated security protocols, analyzing potential threats to web applications, and documenting findings with clear remediation steps for each vulnerability."

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13. How do you keep a DNS secure?

Purpose: This question examines the candidate's expertise in protecting critical network services and preventing unauthorized access.

Answer: "I implement DNSSEC for authentication, regularly monitor DNS traffic for suspicious activity, and maintain strict access controls. This includes protecting against DNS tunneling, maintaining updated security protocols, and implementing proper segmentation to prevent unauthorized access."

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14. Describe your incident response process for security breaches.

Purpose: This comprehensive cybersecurity interview question evaluates a candidate's ability to handle critical incidents effectively.

Answer: "I follow a structured approach—immediate containment of the security breach, assessment of compromised sensitive information, implementation of necessary security measures, and thorough documentation. Post-incident, I conduct detailed analysis to prevent similar security incidents and update security policies accordingly."

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15. What experience do you have with scripting and automation for security tasks?

Purpose: This question assesses the candidate's technical abilities in developing efficient solutions for security management.

Answer: "I develop scripts for automated monitoring of network traffic, vulnerability assessment, and security audits. This includes creating tools for log analysis, implementing automated intrusion detection systems alerts, and developing custom security tools for specific network security requirements."

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$40 hourly
Kirk C.
- 5.0
- (3 jobs)
Ajax, ON
Network Security
Email
Remote Management Software
Antivirus & Security Software
Managed Services
Ubiquiti
Microsoft Azure
Windows Server
IT Support
Computing & Networking
Network Administration
Server Administration
Virtualization
Cloud Migration
Microsoft Active Directory

Remote & On-Site Tech Engineer | 20+ Years in Infrastructure, Support & Cloud Systems I’m Kirk Clark, a seasoned IT Infrastructure Engineer with over two decades of hands-on experience in systems administration, cloud architecture, and technical support. I specialize in delivering scalable, secure, and user-focused solutions across hybrid environments — from enterprise networks to remote operations centres. Whether you need someone to reorganize your network, support your users, or lead a seamless migration, I bring a methodical, transparent, and results-driven approach to every engagement. --- Core Strengths - End-to-end troubleshooting across Windows, macOS, and Linux systems - Microsoft 365, Azure, and AWS cloud deployment and support - AD/Exchange attribute management, PowerShell scripting, and remote diagnostics - VPN setup, endpoint hardening, and network optimization - On-site hardware configuration and remote helpdesk coverage - MSP operations: ticket triage, SLA compliance, and client escalation handling - DNS management, email deliverability, and service account provisioning --- Notable Achievements - Led remote support teams across multiple time zones, maintaining 99.9% uptime - Executed enterprise-wide migrations with zero data loss and minimal downtime - Developed automation scripts that reduced ticket resolution time by 40% - Delivered Tier 2/3 support for high-availability environments and critical infrastructure - Supported government, SME, and cross-border clients with documented, repeatable solutions Education & Training - Associates in Information Technology (2024) - ATHE Level 4 Diploma in Computing (2021) - Certificate in Network Security (CEIT, Guyana, 2019) - Ongoing training in cybersecurity, cloud architecture, and systems administration --- I’m available for both remote and on-site engagements across Canada and internationally. Let’s connect and explore how I can help stabilize your systems, empower your users, and future-proof your operations.
$35 hourly
Ridhwan S.
- 4.9
- (8 jobs)
Putrajaya, PUTRAJAYA
Network Security
Spring Boot
Golang
ASP.NET
DevOps
CI/CD
Python
Terraform
Docker
Kubernetes
Network Analysis
AWS Systems Manager
Load Balancing
Cloud Computing
Network Design
Containerization
JavaScript
Google Cloud Platform
Server Virtualization
Node.js

The engineer you call when software, infrastructure, and networking all need to work together. 🚀 Senior DevOps Engineer | Backend Developer | Cloud & Platform Engineer Most technical problems don't exist in a single layer. An application is slow, but the root cause is the database. A deployment fails because of infrastructure. An API works locally but breaks in production because of networking. AI features underperform because the data pipeline was designed incorrectly. My background spans software development, cloud infrastructure, Linux systems, networking, automation, and AI integrations, allowing me to build and troubleshoot systems end-to-end. Over the last 5+ years, I have worked across AWS, GCP, Kubernetes, Docker, Terraform, CI/CD automation, backend APIs, distributed systems, AI-powered applications, and production environments supporting real business operations. 🎯 What I Can Help With ✅ Backend Development (Node.js, Python, Go, .NET) ✅ Cloud Infrastructure (AWS, GCP) ✅ Infrastructure as Code (Terraform) ✅ Kubernetes & Docker Platforms ✅ CI/CD Automation (GitHub Actions, GitLab CI, Jenkins) ✅ Linux Administration & Troubleshooting ✅ Database Design & Optimization ✅ AI & LLM Integrations (OpenAI, RAG, AI Agents) ✅ Monitoring, Observability & Reliability Engineering ✅ Performance Optimization & Cloud Cost Reduction 🔧 Clients Typically Bring Me In For • Building platforms that require both development and infrastructure expertise • Solving production issues that span applications, databases, networking, and cloud services • Modernizing deployment workflows and DevOps practices • Designing scalable cloud-native architectures • Integrating AI capabilities into existing products • Reducing operational complexity and cloud costs 💻 Core Technologies ☁️ Cloud AWS • GCP • Azure ⚙️ Infrastructure Terraform • Docker • Kubernetes • ECS • EKS • Linux 🖥 Backend Node.js • Python • Go • .NET • FastAPI 🌐 Frontend Next.js • React • TypeScript 🗄 Databases PostgreSQL • MySQL • MongoDB • Redis 🚀 DevOps GitHub Actions • GitLab CI • Jenkins • Monitoring • Observability 🤖 AI OpenAI • LLM Integrations • RAG Systems • AI Agents 💡 I work best with startups, SaaS companies, and engineering teams that need a single engineer capable of owning systems end-to-end—from architecture and development to deployment and operations. 🟢 If your project involves software, infrastructure, automation, or AI, let's talk.
$80 hourly
Kyle A.
- 5.0
- (11 jobs)
Edwardsville, IL
Network Security
Microsoft Active Directory
Technical Writing
Information Security Audit
Network Administration
System Administration
Windows Administration
Windows Server
Technical Support
Information Security

15+ years of IT experience. Former IT Director for large CPA firm and current Systems Administrator for real estate firm. Skills include, Windows administration, network engineering, systems administration, systems deployment, email administration, information security consulting, policy writing, and infrastructure design. Available for any freelance IT work.

$40 hourly
Kirk C.
- 5.0
- (3 jobs)
Ajax, ON
Network Security
Email
Remote Management Software
Antivirus & Security Software
Managed Services
Ubiquiti
Microsoft Azure
Windows Server
IT Support
Computing & Networking
Network Administration
Server Administration
Virtualization
Cloud Migration
Microsoft Active Directory

Remote & On-Site Tech Engineer | 20+ Years in Infrastructure, Support & Cloud Systems I’m Kirk Clark, a seasoned IT Infrastructure Engineer with over two decades of hands-on experience in systems administration, cloud architecture, and technical support. I specialize in delivering scalable, secure, and user-focused solutions across hybrid environments — from enterprise networks to remote operations centres. Whether you need someone to reorganize your network, support your users, or lead a seamless migration, I bring a methodical, transparent, and results-driven approach to every engagement. --- Core Strengths - End-to-end troubleshooting across Windows, macOS, and Linux systems - Microsoft 365, Azure, and AWS cloud deployment and support - AD/Exchange attribute management, PowerShell scripting, and remote diagnostics - VPN setup, endpoint hardening, and network optimization - On-site hardware configuration and remote helpdesk coverage - MSP operations: ticket triage, SLA compliance, and client escalation handling - DNS management, email deliverability, and service account provisioning --- Notable Achievements - Led remote support teams across multiple time zones, maintaining 99.9% uptime - Executed enterprise-wide migrations with zero data loss and minimal downtime - Developed automation scripts that reduced ticket resolution time by 40% - Delivered Tier 2/3 support for high-availability environments and critical infrastructure - Supported government, SME, and cross-border clients with documented, repeatable solutions Education & Training - Associates in Information Technology (2024) - ATHE Level 4 Diploma in Computing (2021) - Certificate in Network Security (CEIT, Guyana, 2019) - Ongoing training in cybersecurity, cloud architecture, and systems administration --- I’m available for both remote and on-site engagements across Canada and internationally. Let’s connect and explore how I can help stabilize your systems, empower your users, and future-proof your operations.
$35 hourly
Ridhwan S.
- 4.9
- (8 jobs)
Putrajaya, PUTRAJAYA
Network Security
Spring Boot
Golang
ASP.NET
DevOps
CI/CD
Python
Terraform
Docker
Kubernetes
Network Analysis
AWS Systems Manager
Load Balancing
Cloud Computing
Network Design
Containerization
JavaScript
Google Cloud Platform
Server Virtualization
Node.js

The engineer you call when software, infrastructure, and networking all need to work together. 🚀 Senior DevOps Engineer | Backend Developer | Cloud & Platform Engineer Most technical problems don't exist in a single layer. An application is slow, but the root cause is the database. A deployment fails because of infrastructure. An API works locally but breaks in production because of networking. AI features underperform because the data pipeline was designed incorrectly. My background spans software development, cloud infrastructure, Linux systems, networking, automation, and AI integrations, allowing me to build and troubleshoot systems end-to-end. Over the last 5+ years, I have worked across AWS, GCP, Kubernetes, Docker, Terraform, CI/CD automation, backend APIs, distributed systems, AI-powered applications, and production environments supporting real business operations. 🎯 What I Can Help With ✅ Backend Development (Node.js, Python, Go, .NET) ✅ Cloud Infrastructure (AWS, GCP) ✅ Infrastructure as Code (Terraform) ✅ Kubernetes & Docker Platforms ✅ CI/CD Automation (GitHub Actions, GitLab CI, Jenkins) ✅ Linux Administration & Troubleshooting ✅ Database Design & Optimization ✅ AI & LLM Integrations (OpenAI, RAG, AI Agents) ✅ Monitoring, Observability & Reliability Engineering ✅ Performance Optimization & Cloud Cost Reduction 🔧 Clients Typically Bring Me In For • Building platforms that require both development and infrastructure expertise • Solving production issues that span applications, databases, networking, and cloud services • Modernizing deployment workflows and DevOps practices • Designing scalable cloud-native architectures • Integrating AI capabilities into existing products • Reducing operational complexity and cloud costs 💻 Core Technologies ☁️ Cloud AWS • GCP • Azure ⚙️ Infrastructure Terraform • Docker • Kubernetes • ECS • EKS • Linux 🖥 Backend Node.js • Python • Go • .NET • FastAPI 🌐 Frontend Next.js • React • TypeScript 🗄 Databases PostgreSQL • MySQL • MongoDB • Redis 🚀 DevOps GitHub Actions • GitLab CI • Jenkins • Monitoring • Observability 🤖 AI OpenAI • LLM Integrations • RAG Systems • AI Agents 💡 I work best with startups, SaaS companies, and engineering teams that need a single engineer capable of owning systems end-to-end—from architecture and development to deployment and operations. 🟢 If your project involves software, infrastructure, automation, or AI, let's talk.
$80 hourly
Kyle A.
- 5.0
- (11 jobs)
Edwardsville, IL
Network Security
Microsoft Active Directory
Technical Writing
Information Security Audit
Network Administration
System Administration
Windows Administration
Windows Server
Technical Support
Information Security

15+ years of IT experience. Former IT Director for large CPA firm and current Systems Administrator for real estate firm. Skills include, Windows administration, network engineering, systems administration, systems deployment, email administration, information security consulting, policy writing, and infrastructure design. Available for any freelance IT work.
$40 hourly
Raul M.
- 4.7
- (7 jobs)
Madrid, Spain
Network Security
Security Engineering
Architectural Design
Wireless Network Implementation
Wireless Security
Network Design
Network Engineering

Dear customers, I spent many time implementing, giving support and managing networks environments. Wireless, security, datacenter & networking. I work with many vendors like palo alto, fortinet, checkpoint, vmware, citrix, cisco, juniper, ubiquiti, Aruba... Palo Alto certified, Aruba ACCP/ACMP certified & CISCO CCNA SEC, CCNA NET, CCNP, CCIE R&S certified. Windows, Linux, MAC, android & IOS systems. Experience 10 + years !
$50 hourly
Feruz I.
- 5.0
- (9 jobs)
Prague, PRAHA
Network Security
Regex Writing
Docker
DevOps
VMware ESX Server
Computer Network
Cisco Certified Internetwork Expert
VMware Administration
VMware vSphere
Network Planning
Network Administration
Network Design
Network Engineering

As a tech-savvy DevOps and IP Architect, I specialize in virtualization, networking, and containers. I deftly turn business needs into smooth tech solutions using Docker, Kubernetes, VMWare, and various cloud services like AWS, Azure, GCP, Hetzner. I also run a premium VPN service for areas with internet restrictions and can customize VPN solutions to fit any business. Let's use technology to elevate your business!
$99 hourly
Sammy B.
- 5.0
- (43 jobs)
Los Angeles, CA
Network Security
Cloud Security
Cybersecurity Monitoring
SOC 2
HIPAA
PCI
Certified Information Systems Security Professional
ISO 27001
Security Infrastructure
Compliance Consultation
Web Application Security
Information Security Audit
Vulnerability Assessment
Penetration Testing
Security Policies & Procedures Documentation

I help organizations of all sizes build, mature, and manage their cloud security and compliance programs. With over 15 years of experience in cybersecurity, I’ve led security initiatives for Fortune 100 companies like Warner Bros., EA Sports, Pfizer, State Farm Insurance, and Goldman Sachs. Today, I work with fast-growing SaaS companies, healthcare organizations, and mid-sized businesses to help secure their cloud environments and achieve compliance goals. My expertise includes: Cloud security architecture and hardening across AWS, Azure, and GCP SOC 2, ISO 27001, HIPAA, and GDPR compliance readiness Cloud risk assessments, gap analysis, and remediation planning Penetration testing and vulnerability management Security program development as a virtual CISO (vCISO) SIEM deployment, configuration, and log monitoring (Splunk, ELK, and cloud-native tools) Security policy and procedure development Incident response planning and tabletop exercises DevSecOps integration and CI/CD pipeline security Certifications include CISSP, CISA, GPEN, GMON, GCCC, CEH, AWS Certified Solutions Architect, CHFI, CWSP, ITIL Foundation, and PMP. I focus on delivering practical, business-aligned security outcomes that reduce risk, meet audit requirements, and build trust with your customers and stakeholders. If you’re looking for help with cloud security, regulatory compliance, or security program leadership, let’s connect. Keywords: cloud security, AWS security, Azure security, GCP security, SOC 2 compliance, ISO 27001 consultant, virtual CISO, vCISO, cybersecurity risk assessment, NIST CSF, CIS Controls, penetration testing, vulnerability management, SIEM deployment, Splunk consultant, ELK Stack security, cloud compliance, HIPAA security, GDPR compliance, cloud incident response, DevSecOps, secure CI/CD, security policies and procedures, cloud security audit, remote security consultant, cloud penetration tester, security roadmap, cloud vulnerability assessment.
$75 hourly
Md Azizur R.
- 4.9
- (31 jobs)
Dhaka, DHAKA
Network Security
Secure SDLC
Security Analysis
Cloud Security
ISO 27001
Security Engineering
Security Policies & Procedures Documentation
Security Testing
Source Code Scanning
Information Security
Penetration Testing
Application Security
Cybersecurity Management
Database Security
Vulnerability Assessment

I help organizations become audit-ready, secure, and compliant - without overengineering or slowing down business. With 17+ years in cybersecurity, I operate as a Fractional CISO (vCISO), bridging technical execution, risk governance, and compliance across fast-growing SaaS companies, fintech, and enterprise environments. I specialize in building end-to-end security programs aligned with: ISO/IEC 27001 SOC 2 NIS2 Directive HIPAA 🎯 What I Deliver 🔐 Compliance & Audit Readiness SOC 2 Type I & II end-to-end readiness ISO 27001 ISMS design, implementation & audit support NIS2 gap assessment & full implementation roadmap HIPAA compliance for SaaS, VoIP, and cloud platforms 🛡️ Security Leadership (vCISO) Security strategy aligned with business goals Risk management (NIST CSF, CIS Controls) Board-level reporting (Risk vs Cost vs Impact) Vendor & third-party risk management ⚙️ Technical & Cloud Security AWS / GCP / Azure security architecture & hardening DevSecOps & Secure SDLC (SAST, DAST, IAST integration) Application & API security testing Identity & Access Management (IAM / PAM) 🔍 Offensive Security & Assurance Penetration testing (Web, mobile and Network) Red team simulation & threat modeling Secure code review & vulnerability management 🧠 Why Clients Hire Me I don’t just deliver policies - I deliver working security programs I translate technical risk into business decisions I align compliance with real-world architecture (AWS, SaaS, DevOps) I help you pass audits AND actually be secure 🏆 Credentials CISM • CISA • CEH • ECSA • LPT (Master) ISO 27001 Lead Implementer (BSI) AWS Security Specialty • Azure Security (AZ-500) 💡 Engagement Model Fractional CISO (ongoing advisory) Compliance programs (SOC 2 / ISO 27001 / NIS2 / HIPAA) Security assessments & remediation Audit readiness & evidence preparation 🚀 Let’s Talk If you're preparing for an audit, scaling securely, or need a CISO-level partner without full-time cost, I can help you get there efficiently.
$100 hourly
Corwyn J.
- 5.0
- (3 jobs)
Suffolk, VA
Network Security
Cisco IOS
Network Planning
Network Engineering
Network Architecture
Network Administration
FortiGate Firewall
Fortinet
Cisco Router
Enhanced Interior Gateway Routing Protocol
Cisco Certified Network Professional
Cisco Meraki
Network Design
OSPF
Cisco ASA

Results-driven & remote-first Senior Network Engineer with 14+ years of experience designing, implementing, and supporting enterprise network infrastructure across financial services, government, and Fortune 500 environments Strong expertise in Cisco and Fortinet SD-WAN, BGP, OSPF, EIGRP, MPLS, and VPN technologies, network security, and monitoring tools, with a track record of reducing downtime, improving reliability, and supporting mission-critical systems. Strong experience in co-location (co-lo) data center design, architecture, configuration, monitoring, supporting high availability, and failover testing to ensure minimal business impact. Proven ability to lead full lifecycle network initiatives including design, build, implementation, configuration, testing, and optimization. Highly developed communications and administrative skills, with over 14 years’ experience executing back-office responsibilities that provide transparency and accountability to all program stakeholders CORE EXPERTISE • Network Architecture & Design (Scalable, Secure, High Availability, Route Filtering) • Routing & Switching: BGP, OSPF, MPLS, TCP/IP • Network Security: Firewalls, VPNs (IPsec/SSL), VPN, DMVPN, IDS/IPS, Encryption • Network Optimization & Performance Tuning • Cisco SD-WAN & Fortinet SD-WAN • Network Design & Architecture (LAN/WAN, co-lo, hybrid cloud) • Routing Protocols: BGP, OSPF, EIGRP, OMPV, ADVPN • Failover Design & Testing (High Availability, Redundancy) • Enterprise Routing & Switching: Cisco Nexus, Catalyst • Firewalls: Palo Alto, Cisco ASA/FTD, FortiGate • Cloud Networking: Azure (ExpressRoute), AWS exposure • Monitoring & Troubleshooting: SolarWinds, ExtraHop, Splunk, Wireshark, vManage • Incident Response & Root Cause Analysis (RCA) • Capacity Planning & Network Scaling • Hardware Deployment (Routers, Switches, AP’s, Firewalls) • Change Management & Documentation: ServiceNow • Vendor Management & Issue Resolution • High Availability & Disaster Recovery Testing • Scripting & Automation (basic task automation) • Documentation: Network diagrams (Visio), runbooks, SOPs ________________________________________ REMOTE WORK CAPABILITIES • Lead end-to-end network design and SD-WAN deployments remotely across enterprise environments • Execute remote configuration, testing, and failover validation with zero on-site dependency • Coordinate with cross-functional teams to deliver high-impact infrastructure changes with minimal disruption • Manage and troubleshoot large-scale distributed networks (300+ sites) in real time
$70 hourly
Samson A.
- 5.0
- (21 jobs)
Kennesaw, GA
Network Security
Security Operation Center
Security Engineering
Cloud Engineering Consultation
Cloud Computing
Cloud Security
Security Analysis
Google Cloud Platform Administration
Information Security Governance
Information Security
Configuration Management

passionate security enthusiast interested in assisting a team increase their security posture by providing guidance and consultation on building and improving security operation capabilities, reducing overall attack surface with proper vulnerability management, and security engineering/architectural improvements.
$50 hourly
Filip D.
- 5.0
- (1 job)
Skopje, KARPOŠ
Network Security
Network Engineering
IT Support
Data Center
Data Center Operations
Google Cloud Platform
FortiGate Firewall
Load Balancing
Cisco Certified Network Associate
Cisco Certified Entry Networking Technician
Network Administration

Brief overview of my experiences and leading goals regarding the networking: As IT Network Engineer i have 5+ years of experience in relationship primarily with Cisco, Fortinet and F5-Load Balancer Technologies. I've been introduced with IT Support Engineer(L1), Engineer on field(installing and connecting the networking device), Data Center Engineer(configuring the ACI architecture). There are several certificates that i arrange through the years such as CCT, CCST, CCNA, CCNP-DCACI, FCA. With everyday hand-on and learning on real production environment i pretend to grow and lead more achievement in future.
$60 hourly
Sudhakar D.
- 5.0
- (14 jobs)
Sydney, NSW
Network Security
Security Management
PCI DSS
Cloud Security Framework
Web Application Security
Mobile App Testing
API Testing
Fuzzing
Reverse Engineering
Risk Assessment
Information Security Consultation
Vulnerability Assessment
Penetration Testing

"Very professional went beyond expectations in covering the full scope. On-time completion of work. Coordinated well and final work output was well documented." - Treehouse Innovation With over 10 years of experience in the dynamic field of information security, I have honed my expertise through a variety of challenging projects across diverse technology landscapes. My passion lies in innovating through automation, streamlining complex processes to reduce manual workload, and ensuring robust security protocols. My specialization in penetration testing spans across multiple domains, ensuring comprehensive security assessments and solutions: - Network Security: Proficient in vulnerability assessments and penetration testing for robust network security. - Web & API Security: Skilled in identifying and mitigating vulnerabilities in web applications and APIs. - Cloud Environment Security: Experienced in securing various cloud platforms, safeguarding critical data and infrastructure. - Application Security: Adept at thick client and mobile application (APK/iPA) security assessments. - Code Review: Proficient in conducting thorough source code reviews to identify and rectify security loopholes. Certifications: My commitment to excellence in information security is reflected in my extensive list of certifications: - Offensive Security Certified Expert (OSCE) - Offensive Security Certified Professional (OSCP) - Certified Red Teaming Expert (CRTE) - GIAC Exploit Researcher and Advanced Penetration Tester (GXPN) - PentesterAcademy Certified Enterprise Security Specialist (PACES) - Microsoft Certified: Azure Security Engineer - Certified Ethical Hacking and Security Professional (CEH-SP) - Microsoft Technology Associate: Security Fundamentals - Microsoft Certified Professional - Certified Payment Card Industry Security Implementer (CPISI) Client Engagement & Confidentiality: I adhere to the highest standards of professionalism and confidentiality. An NDA (Non-Disclosure Agreement) is always an option to ensure the security and privacy of your project.
$40 hourly
Jawad Saqib B.
- 4.8
- (44 jobs)
Rawalpindi, PUNJAB
Network Security
Code Review
Python
Security Analysis
Website Security
Mobile App Testing
Security Engineering
Cloud Security
Penetration Testing
Security Assessment & Testing
Cybersecurity Management
Malware Removal
Information Security
Vulnerability Assessment
Information Security Consultation

✅ Amongst the Top 1000 hackers worldwide Web Pentesting | Mobile App Pentesting | API Pentesting | Vulnerability Assessment | Python & Bash Automation I work with companies to make their digital assets secure and provide solutions to enhance their security parameters. I create cybersecurity content on hackingloops.com explaining the practicalities and how-tos of the vulnerability and exploitation Part-time bug bounty hunter at Bugcrowd & Intigriti. Feel free to contact me for your queries and security-related issues.
$50 hourly
Ashish J.
- 5.0
- (26 jobs)
Ahmedabad, GUJARAT
Network Security
Network Architecture
Cisco UCS
Server Virtualization
Information Security
Cisco Meraki
ARCserve
Fortinet
Sophos Sophos UTM
Network Design
Web Application Firewall
Cybersecurity Management
Cisco ISE
Cisco ASA
Firewall

Dedicated and highly experienced Network Security professional with 20+ years of proven expertise in designing, implementing, and maintaining robust network and security. Oversee large-scale IT projects, networks, and infrastructures. Outstanding results and complete projects on time.  Firewalls: • Sophos UTM, XG and XGS all models, Dynamic routing and XDR. • Fortigate all models, FortiManager, FortiAnalyser., FortiAP, FortiSwitch • Checkpoint Firewall • Cisco Meraki, Cisco Firepower (FMC) Cisco ASA-5515, 5520,5550,5506-x. • Cisco Wireless Access point and WLC. • Cisco ISE • Watchguard all models Dynamic Routing. • Firewall Configuration migration. • Sophos Firewall policy, Dynamic routing, HA, SD-WAN, VPN and other configurations Managing, Troubleshooting. • Fortigate Firewall Policy configuration, Dynamic routing, HA, SD-WAN, External Connectors configuration. Managing, Troubleshooting. • FortiNAC, FortiManager. FortiAnalyzer, Fortinet SASE & EMS. • Watchguard Firewall Policy, Dynamic routing, UTM, SD-WAN configuration, HA, Managing, Troubleshooting. • Cisco Firewall Policy configuration, VPN, Failover, IPS-IDS Managing, Troubleshooting. • Cisco Meraki MX deployment and troubleshooting. • Cisco Identity Service Engine ISE design and deployment with HA Managing, Troubleshooting. • All Firewall VPN - IPSec, Site-To-Site VPN, SSL VPN. • ManageEngine Endpoint Central implementation and support  Routing & Switching • Cisco Routers almost all router including ISR 1000,4000 series Managing, Troubleshooting. • Cisco Switching Catalyst all models, Nexus all models Managing, Troubleshooting. • Routing Protocol - OSPF, EIGRP, and BGP. • NAT, Policy-based Routing, QoS, Traffic shaping. 1:- Send me an invite 2:- Lets connect over the call or message. 3:- I will ask you few questions for your requirements 4:- Will provide you exact plan for your goal with expected duration 5:- After agree on all points and looks good we can execute the plan Just click on Invite button and let's work together. #SDWAN #Fortinet #Fortigate #FortiNAC #PaloAlto #DNACenter #SDN #ISE #IdentityServicesEngine #Firepower #CiscoUmbrella #EmailSecurityAppliance #WebSecurityAppliance #CloudWebSecurity #ciscoasa #Meraki #Stealthwatch #ManageEngine #Sophos #Watchguard #VPN #ASA #Telepresence #IPCameras #ASR1K #ASR9K #NexusSwitches #PrimeInfrastructure #IPTelephony #NetworkDesigning #Monitoring #SecurityInfrastructure #Acronis #Arcserve
$75 hourly
Payton G.
- 5.0
- (13 jobs)
San Antonio, NM
Network Security
VoIP
Network Design
AWS Systems Manager
AWS Lambda
AWS CodeDeploy
System Security
Penetration Testing
Network Engineering
Vulnerability Assessment
Customer Service
Network Administration
Technical Support
Data Entry
VoIP Administration

I bring over 15 years of progressive experience in IT, providing comprehensive technical solutions that drive business performance and security. My career has spanned multiple domains, giving me a broad yet deep expertise that allows me to align technology with organizational goals. IT Security Professional (5 years): Proven expertise in safeguarding enterprise environments through risk assessments, compliance alignment, vulnerability management, and incident response planning. Skilled in developing security frameworks that balance protection with operational efficiency. VoIP Engineer (7 years): Designed, implemented, and supported scalable VoIP solutions for enterprise clients. Experience includes SIP trunking, PBX integration, call center technologies, and troubleshooting voice quality issues to ensure reliable, cost-efficient communication. System Administrator (10 years): Extensive hands-on background managing Windows and Linux environments, Active Directory, virtualization platforms, storage, and cloud services. Adept at performance tuning, disaster recovery planning, and automation for seamless IT operations. Technical Support (15 years): Strong foundation in customer-facing IT support, with the ability to communicate complex technical concepts in simple terms. Recognized for building trust with stakeholders, reducing downtime, and ensuring user satisfaction. By combining security, infrastructure, communication, and end-user support expertise, I deliver holistic IT consulting that helps organizations reduce risks, optimize systems, and achieve scalable growth. My goal is to be a trusted partner, ensuring technology becomes a driver—not a barrier—to business success.
$75 hourly
Akil G.
- 4.7
- (2 jobs)
New York City, NY
Network Security
Network Engineering
Database Administration
Microsoft Exchange Server
Network Administration
Systems Engineering
Solution Architecture
Web Development
Microsoft Azure
Management Skills
Information & Communications Technology
Microsoft Windows
Enterprise Architecture
System Administration
Google Cloud Platform
VPN

I serve as a Technical Lead whose expertise is amassed via a 20+ year span of developing notable solutions for business partners of various core function and size. My career journey has graced me in assembling depth in knowledge and experience across many verticals in the Technology field. I rigorously learn to stay ahead with the new and emerging in this field. My passion is to provide quality innovative solutions and exceptional customer service to any team towards their efforts in achieving goals. [CERTIFICATIONS] Microsoft Certified MCSE Infrastructure & Private Cloud. [SKILLSETS] Infrastructure Technologies: - Microsoft Cloud (Microsoft Azure, , Microsoft Power Platform, Windows 365, Microsoft Security, Dynamics 365) - Microsoft On-Prem (Windows Server, including Active Directory, DHCP, DNS, Federation, , Hyper-V, - Red Hat Unix Server - CentOS Server & Desktop - Ubuntu Server & Desktop - VMware vSphere - Google Cloud Platform (Compute, Storage, Databases, Networking) - Scripting Unified Communication Technologies - Microsoft Teams (Meeting and Conferencing, Teams Phone, Chat, Collaboration, Devices) - Google Meet - Cisco WebEx Suite, Cisco UC (Business Edition 7000/6000, Communications Manager, CUBE, Expressway Series, IM & Presence, Unity Connection, Jabber, Voice Gateways, Contact Center) - Zoom (Zoon One, Zoom Spaces, Zoom Events) - Avaya (UCaaS, Enterprise Cloud, Cloud Office, Aura Platform, IP Office, Session Border, Experience Platform, Voicemail) Productivity & Collaboration Technologies - Microsoft 365 (Exchange Online, Office 365, SharePoint Online) - Microsoft Exchange Server, SharePoint Server, Skype for Business Server - Google Workspace (Gmail, Calendar, Drive, Docs, Sheets, Slides, Chat, Sites, Forms, Jamboard) Networking Technologies - Cisco IOS Routers: ASR Series, ISR Series, Cellular Gateways Switches: Catalyst Series, Nexus Series, Meraki Series, SX, CBS ; IOS, Wireless: Catalyst, Aironet, and Meraki APs & Controllers - Juniper (JunOS) Routers: MX Series Switches: EX Series Wireless: MIST APs - Fortinet Switches: FortiSwitch Wireless: FortiAP Security Technologies - SEIM: McAfee Nitro - NG-AV: Carbon Black, Sentinel One, Symantec, Trend Micro, - NGFW: Palo Alto PA-Series Firewalls (PanOS), Panorama; Fortinet FortiGate Firewalls (FortiOS); Cisco Firepower ASAs; Juniper SRX Firewalls - NAC: ForeScout - IDS: Snort, Security Onion - IPS: Trellix/Core Security - Developer & Scripting Technologies - .NET, Java, C#, C++, HTML/CSS/JavaScript, PHP, Python, Perl - PowerShell
$80 hourly
Kevin H.
- 4.5
- (13 jobs)
Union, MO
Network Security
Network Engineering
Web Application
Information Security
Web Server
Web Design
API Development
Website Redesign
SQL
PHP
JavaScript
Python
Web Service
API

I am a web and software developer with over 10 years of experience working in multiple programming languages and frameworks. I specialize in responsive and reactive applications that are both functional and appeasing to the eye. I focus on futureproofing your app by planning for scalability both in size of the customer-base and infrastructure changes needed in the future.
$55 hourly
Umer T.
- 4.8
- (8 jobs)
Jakarta, JK
Network Security
AI Security
Cloudflare
Website Security
WordPress Security
Ethical Hacking
Risk Assessment
Compliance
OWASP
Vulnerability Assessment
Linux
PCI DSS
Firewall
Security Operation Center
Penetration Testing
Cybersecurity Tool
Information Security
Cyber Threat Intelligence
Cybersecurity Management
Cybersecurity Monitoring

Most security consultants show up after something breaks. I get brought in before it does. I work with companies that take their security posture seriously, whether that means building out a SOC function from scratch, running structured penetration tests against production environments, or walking a business through the full PCI DSS compliance lifecycle as a Qualified Security Assessor. My work sits at the intersection of offensive and defensive security. On the offensive side, I conduct web application, network, and infrastructure penetration tests using methodologies aligned with OWASP, PTES, and NIST. On the defensive side, I build and tune SOC workflows, threat detection pipelines, SIEM configurations, and incident response playbooks that actually get used. For clients in fintech, e-commerce, and SaaS, PCI compliance is often the most high-stakes engagement. I handle scoping, gap assessments, control implementation, and QSA reporting without the consultant-speak that most firms hide behind. A few things that stay consistent across every engagement: I document everything, I communicate findings in plain language to both technical and non-technical stakeholders, and I do not disappear after delivery. If you are dealing with an audit, a breach, a compliance deadline, or just a security program that needs a second set of expert eyes, let's talk.
$75 hourly
Marcelo V.
- 5.0
- (21 jobs)
Requiao, BRAGA
Network Security
DNS
Microsoft Active Directory
VMware vSphere
Virtual LAN
Network Administration
LAN Implementation
Fortinet
Cisco UCS

My approach involves a meticulous understanding of project requirements, coupled with a hands-on approach to problem-solving. I am committed to delivering comprehensive solutions that span from the endpoint to the perimeter, ensuring the integrity and security of your IT infrastructure. Key Areas of Expertise: - Cybersecurity: Specialized in Fortinet products - Fortigate, Forticlient, FortiEMS, Fortianalyzer, FortiManager, Fortiswitch, FortiAP - with a keen focus on innovative solutions. I'm also Fortinet NSE4 certified and an official Advocate Fortinet Partner. - Virtualization: Proficient in installation, configuration, and troubleshooting of virtualization solutions using VMware and Hyper-V. - Cloud Solutions/Architect: Well-versed in Microsoft 365 and Azure cloud solutions. - Networking: Extensive experience in building and implementing end-to-end projects for small/medium LAN/WAN environments using a variety of vendors and technologies like Cisco, Aruba, and Fortinet. Why Choose Me? - Diverse Skill Set: As a "jack of all trades," I bring a wealth of experience across various IT domains. - Cybersecurity Focus: My dedication to Cybersecurity and Fortinet projects ensures cutting-edge solutions. - Commitment: I am incredibly responsive, responsible, and available for any IT infrastructure/operation project, ready to contribute my expertise to drive your success.
$53 hourly
AmitKumar P.
- 5.0
- (22 jobs)
Ahmedabad, GUJARAT
Network Security
Network Penetration Testing
Website Security
Web App Penetration Testing
Web Application Firewall
Cloud Security
Security Analysis
Code Review
Vulnerability Assessment
Security Assessment & Testing
Penetration Testing
Malware Removal

A seasoned and dynamic cybersecurity professional with over 10 years of comprehensive experience in IT security, specializing in various domains including Vulnerability Assessment and Penetration Testing (VAPT), Web Application Penetration Testing (WAPT), API VAPT, Thick-Client Application Penetration Testing, Mobile Application Penetration Testing, Threat Hunting, Malware Analysis, and Firewall Security. Throughout my career, I have honed my skills using a wide array of industry-leading tools such as Burp Suite, Metasploit, ZAP Proxy, NMAP, DirBuster, WafW00f, QualysGuard, Nessus, Kali Linux, Wireshark, The Harvester, Sublist3r, LBD, SET, and Website-Watcher. My hands-on experience extends to working with LAN and WAN topologies, TCP/IP protocols, routers, switches, and firewalls within Internet, Intranet, and Extranet environments. My expertise includes conducting in-depth security research, analysis, and design for client computing systems and network infrastructure. I hold multiple esteemed certifications, including Certified Ethical Hacker (CEH, MILE2|CPTE|OSCP), ISO 27001 Information Security Lead Auditor, and ISO 9001 Quality Lead Auditor. I have had the privilege of working with a diverse clientele, including renowned names such as Glasswall, TIM Solutions, Extractable, Scramble, Crowdo, datalligence.ai, C.L.E. IT Solutions, Golteum, Graviton Consulting, Widia, CaringHumans, Technosprints, Blooms, Brainiot, Mazeart, and Tax Adda. Currently, I am associated with WebOrion, a leading cybersecurity firm, where I leverage my extensive expertise to deliver robust security solutions and comprehensive training programs. At WebOrion, we are committed to enhancing our clients' cybersecurity posture through innovative and effective security measures. If you are seeking a dedicated and highly skilled cybersecurity professional to address your security needs, let's connect and discuss how I can contribute to securing your digital assets.
$40 hourly
Johar A.
- 5.0
- (75 jobs)
Sharjah, SH
Network Security
Firewall
Writing
Cybersecurity Management
Security Infrastructure
UniFi
Mikrotik RouterBOARD
Cisco ASA
WiFi
PfSense
Windows Administration
Palo Alto Firewalls
FortiGate Firewall
Network Design
VPN

EXPERT-ENGINEER | TOP RATED Network & Security Expert with 100% JOB SUCCESS. 👌 A HIGHLY SKILLED NETWORK ENGINEER in Upwork. Specialized in modern technologies engineering aspects with a wide range of analytical, configure, administer, manage, and troubleshooting skills. 🥇 Here are the certifications that I have: ✔️• NSE 1 (FORTINET Network Security Expert) Certified. ✔️• NSE 2 (FORTINET Network Security Expert) Certified. ✔️• NSE 3 (FORTINET Network Security Expert) Certified. ✔️• NSE 7 (FORTINET Network Security Expert) Certified. ✔️• CCNA (CISCO Certified Network Associate) Security Certified. ✔️• CCNP (CISCO Certified Network Professional) Security Certified. ✔️• INTEL Data center Certified. ✔️• HCIE (Huawei Certified ICT Expert) R&S (Datacom) Certified. ✔️• AZ-303 (Microsoft Azure Architect) Certified. Tools: ZenDesk, FreshDesk, Jira, Service-Now, Orion. Whatsup Gold, Solarwind 💥 I take up projects and responsibilities only when I am confident and only when I can provide 100% satisfaction for my client. + 5 years experience as Senior Network Engineer / Network Architect + 2 years experience as Team Lead Solutions focused meticulous and result in oriented Senior Network Engineer professional offering above 10 years of a successful career in IT & Telecom arena distinguished by commended performance and proven results. Network Engineering Key Qualifications: ✅ Deep understanding of Routing protocols and Overlay - EIGRP, OSPF, IS-IS, BGP, MP-BGP, VRF, Multicast, AnyCast, MPLS, L2VPN, L3VPN, MPLS-TE, RSVP, LLDP, DSCP/QoS, VXLAN, eVPN, SD-WAN, SDA, ACI, DNA Center ✅ Experience with Routing & switching platforms - Cisco Router ASR9K, ASR1K,CRS, NCS, 7500, 7600, 7200, CSR, 3900, 2800, Catalyst 9200, 9300, 9400, 9500, 9600, 6500, 6800, 6500, 4510, 4948, 3850, 3700, 3560, 2960, Nexus 9K (NX-OS, ACI) , 7k, 5k, 3k, 2k, Cisco ASA55xx, FTD, FMC, Juniper QFX5100, QFX5110, EX 9200, 4500, 4300. 3300, 2200, SRX) ✅ Knowledge of Wireless standards and protocols - WPA/WPA2, 802.1x, 802.11a/b/g/n/ac/r/k, CAPWAP, RMM, WMM, X.509, CA Authority, MDM, AAA, Kerberos, Captive Portal, Guest Access, Posturing, Profiling, DACLs, PACLs ✅ Experience and deep understanding of AAA appliances - Cisco ISE, Cisco Unified Computing System UCS B Serious, UCS C Serious, Cisco WAAS, ACS, NAC, AAA, Single Sign-On. ✅ VCF and NSX-T Architecture and Design. Focused virtualization Full Stack SDDC and VCPP also I am practicing NSX-V, NSX-T, Multi-Tenancy Architecture, vCloud Director, vCloud Availability, vRealize Suite, vSAN, VXRAIL, Horizon View, Physical SAN storages (iSCSi, Fibre Channel) and Velocloud (SD-WAN) ✅SD-WAN. CISCO ACI SDN SPECIALIST ✅ Proven track record of excellence in analyzing business requirements to develop technical network solutions and their framework; Leadership role on network infrastructure projects to design and architect large-scale networks. ✅ Instrumental in developing architectural strategy, including technology standardization and modernization of enterprise, data center, and disaster recovery network infrastructures. ✅ Adroit in writing reference architectures and strategic roadmaps for network & network security technologies, and solution architectures for various infrastructure initiatives ✅ Synchronize with other Architects in designing solutions that are reusable, quick to market, and lower the total cost of ownership. ✅ Highly articulate, demonstrating exceptional relationship building, communication, analytical and interpersonal skills. ✅ Specialized Cisco ISE infrastructure deployment administration and operations as well as extensive experience dot1x configuration and troubleshooting for wired and wireless network. Wired and wireless guest portal deployment expert.. ✅ Extensive experience configuring and troubleshooting AnyConnect User tunnels and Management tunnel by using certificate and ISE for authorizing the group policies along with Hostscan and posture predeploy module. 💥Joint adventure with a partner that provides popular cloud expertise as following; ✅ Amazon Web Services (AWS) ✅ Microsoft Azure ✅ Huawei Cloud ✅ Google Cloud ✅ Alibaba Cloud
$40 hourly
Djordje S.
- 5.0
- (1 job)
Belgrade, CENTRAL SERBIA
Network Security
Security Operation Center
Information Security Consultation
Information Security Audit
Security Engineering
Technical Support
Linux System Administration
DSL Troubleshooting
MikroTik RouterOS
Computer Network
Cisco IOS

Hello, My name is Djordje. Im experienced NOC engineer. From 2009 I’m working in sphere of internet technologies. My first job was technical support at YUBC net ISP company. Also I worked for Orion ISP company as NOC engineer, after Orion i was also worked as NOC engineer at Telenor mobile company. Now i work at Telesign company also as NOC engineer. I like to learn new stuff, and my interests are networking. I m also at basic level of Linux admistration knowledge. Since 2021. I started Cyber Security path in my career, so I first work as Information Security Analyst for 2 years, gain ComTia Security + Certificate and moved forward as Security Engeener. I have lot of expirience with cyber security procedures, can help with gaining Cyber Essentials and Cyber Essentials Plus certificates
$95 hourly
Attiq R.
- 5.0
- (11 jobs)
Bolton, ENGLAND
Network Security
Blockchain
Smart Contract
Cisco Certified Network Associate
Python
Full-Stack Development
Network Administration
Game Development
Web Development
Check Point
App Development
iOS Development
Firewall
Cisco ASA

✅🌟CCSM Elite Certified (Checkpoint Certified Security Master Elite) CISSP ISC2 Certified, CCNP Security (Cisco Fire Power) and Palo Alto NGFW Engineer Certified🌟✅ 🌟Experienced Network Security Specialist with 15+ years history with Check Point, Cisco ASA, and Palo Alto Firewalls and CISSP Certified🌟 ⚒Extensive work experience with Check Point VSX, MDS, Quantum Smart-1 Cloud, Check Point Infinity, Cloud Guard Connect/Edge, Harmony End Point, Cloud Guard SaaS (Now Harmony Email & Office), Cloud Guard Connect/Edge (Now Harmony Connect and Quantum Edge) alongside working with Enterprise level clients⚒ ⚡Done numerous Check Point upgrades over the last ten years on different topologies, including standalone, distributed, cluster and virtual environments from R75.x to R81.x⚡ 🥇Cisco ASA firewall experience with valid CCNP Security certification🥇 💡Palo Alto Certified NGFW Engineer 💡 💡ISC2 CISSP Certified 💡 🥇 Working towards ISO 27001 lead Auditor Certification 🥇 🌟 WHY CHOOSE ME OVER OTHER FREELANCERS? 🌟 ⚡ Client-Focus: I focus on providing VALUE to all my clients. ⚡ Work Ethic: Going the “extra mile” is core to my work as a Freelancer. ⚡ Responsiveness: I am responsive and keep all lines of communication readily open with my Clients. ⚡ Kindness: One of the most important aspects of my life is to treat everyone with respect, be empathetic in all situations.
$65 hourly
Shawon S.
- 4.9
- (35 jobs)
Mohammadpur, F
Network Security
Artificial Intelligence
Network Administration
Automation
CRM Software
Software
Amazon Web Services
Google Cloud Platform
Azure DevOps
Cloud Management
Cloud Engineering Consultation
Cloud Engineering
System Administration
Admin Panel Setup
Linux System Administration

As an Open-Source Solutions Specialist, I help businesses gain control over their software stack by implementing powerful, secure, and scalable open-source alternatives to expensive proprietary platforms. Are you looking to reduce recurring software fees or need a custom solution that fits your exact needs? I specialize in deploying and managing a wide range of open-source applications, from comprehensive ERP systems to robust server environments. ✅ My Open-Source Implementation Services: ERP & CRM Systems: Full setup, customization, and maintenance for Odoo, ERPNext, SuiteCRM, and other platforms to manage sales, inventory, and accounting. Linux System Administration: Expert configuration, hardening, and management of servers running Ubuntu, Debian, and CentOS for optimal performance and security. DevOps & Automation: Implementing CI/CD pipelines with Jenkins and GitLab CI, containerizing applications with Docker, and automating configuration with Ansible. Web & Application Hosting: Deploying and managing web servers (Nginx, Apache), databases (PostgreSQL, MySQL), and self-hosted applications like Nextcloud and WordPress. ✅ Key Open-Source Technologies: Business Applications: Odoo, ERPNext, SuiteCRM, Magento, WooCommerce. Operating Systems: Linux (Ubuntu, CentOS, Debian), FreeBSD. DevOps & Containers: Docker, Kubernetes, Jenkins, Ansible, Git. Virtualization: Proxmox VE, KVM, VMware. Web & Database: Nginx, Apache, PostgreSQL, MySQL/MariaDB. Let's connect to discuss how a tailored open-source solution can empower your business.
$50 hourly
Erwan L.
- 4.6
- (3 jobs)
Bangkok, BANGKOK
Network Security
Vulnerability Assessment
Information Security
Security Analysis
Penetration Testing
Security Testing

I help e-commerce businesses identify visible security risks through external, manual and non-intrusive security audits. I work with online stores built on WordPress/WooCommerce, PrestaShop, Shopify, Magento and other e-commerce platforms. My audits are designed to give store owners, agencies and business teams a clear, independent and actionable view of their website’s external security posture. The assessment focuses on publicly observable risks: exposed CMS or e-commerce components, weak security headers, HTTPS and browser trust issues, login and account area exposure, public API exposure, third-party scripts on sensitive pages, checkout-related security signals, domain/email indicators and visible misconfigurations. You will receive a concise report explaining: - what was observed - why it matters - the possible business impact - the priority level - what your developer or technical provider should fix first I am OSCP certified and have practical experience in offensive security, web application testing and vulnerability assessment. I do not sell website maintenance or remediation services. My role is to provide an independent assessment and a clear roadmap for your technical team. This service is especially useful before a campaign, after a redesign or migration, before a cyber insurance request, or when you need an independent view of your e-commerce security posture.
$75 hourly
Driss J.
- 5.0
- (81 jobs)
Rabat, RABAT-SALÉ-KÉNITRA
Network Security
Cybersecurity Management
Automation
Network Architecture
Intrusion Detection System
VPN
Firewall
Network Engineering
F5, Inc.
FortiGate Firewall
Cisco Certified Network Professional
Cisco ACI
Microsoft Azure
System Administration
Virtualization

When your network goes down or your firewall misses a threat, the cost isn't just technical — it's operational. I help businesses design, migrate, and harden enterprise network infrastructure so that downtime, misconfigurations, and security gaps stop being a recurring problem. With 8+ years of hands-on experience across Fortinet, Cisco, and Palo Alto environments — and certifications in CCNP, NSE7, AWS Solutions Architect, and CEH — I bring architecture decisions backed by real production deployments, not just textbook theory. What I deliver: — Multi-site FortiGate/FortiManager deployments with centralized policy management across distributed branch offices — BGP and OSPF routing migrations from legacy static routing, with zero-downtime cutover planning and rollback procedures — Cisco ACI fabric design and Palo Alto NGFW policy hardening for compliance-driven environments (PCI-DSS, SOC 2) — AWS and Azure cloud connectivity via IPSec VPN and SD-WAN overlay with full redundancy and failover testing — FortiManager automation: bulk route updates, ADOM policy management, and config auditing via scripting Technologies I work with daily: FortiGate · FortiManager · FortiAnalyzer · Cisco IOS/IOS-XE · Cisco ACI · Palo Alto NGFW · Panorama · BGP · OSPF · EIGRP · SD-WAN · IPSec/SSL VPN · Zero Trust architecture · AWS networking · Azure Virtual WAN I communicate clearly throughout every project and document everything — so your team isn't left with a black box when the engagement ends. If your infrastructure needs a specialist who can read your current config, identify the real problem, and implement a clean fix — let's talk.
$45 hourly
Nikolai S.
- 5.0
- (3 jobs)
Bangkok, BANGKOK
Network Security
API Development
Solana
macOS
Software Architecture & Design
VIPER
Blockchain
Back-End Development
Swift
Solidity
Rust
Kotlin
Android
iOS
iOS Development
VPN

Software engineer with 7+ years of experience specializing in Rust systems programming, back-end architecture, and blockchain development. 4+ years building production Rust applications for high-performance, safety-critical systems. Expert in leveraging Rust's ownership model and concurrency primitives to solve complex threading challenges in mission-critical middleware. Architected and optimized high-scale VPN infrastructure serving millions of users, utilizing Rust's zero-cost abstractions for performance gains. Built complete Solana DEX from scratch using Rust/Anchor framework, implementing automated market makers, liquidity pools, and sophisticated fee collection mechanisms. Deep expertise in async Rust, tokio runtime optimization, and systems-level performance tuning. Additional background includes 3+ years mobile development (15+ iOS/macOS apps in Swift/Objective-C, Android in Kotlin), with proven ability to architect cross-platform solutions. Consistently delivers memory-safe, high-performance solutions for demanding distributed systems, leveraging Rust's type system and tooling ecosystem to eliminate entire classes of bugs while maintaining bare-metal performance.
$40 hourly
Klajdi H.
- 4.9
- (33 jobs)
Tirana, TIRANË
Network Security
Cisco Certified Internetwork Expert
Security Engineering
Sophos Sophos UTM
Cisco Firepower Threat Defense
Fortinet
Wireless LAN Controller
Cisco Certified Network Professional
Network Engineering
Cisco Router
Mikrotik RouterBOARD
Network Planning
Cisco Meraki
Cisco Certified Entry Networking Technician
Network Monitoring
Cisco IOS
Cisco ASA
Cisco Certified Network Associate

Senior Network & Security Engineer | Cisco Certified Trainer | MPLS & Enterprise Networking Specialist I am a highly accomplished Network & Security Engineer with over 10 years of proven experience designing, implementing, and securing large-scale network infrastructures across ISPs, banking systems, government institutions, and public sector environments. As a certified Cisco Networking Academy instructor, I combine deep technical expertise with a passion for teaching—helping students and professionals master networking concepts and successfully overcome CCNA (Routing & Switching) challenges using Cisco Packet Tracer and GNS3. I specialize in building high-performance, scalable, and secure networks, with strong expertise in: - MPLS architecture and deployment in enterprise and ISP environments - Dynamic routing protocols: OSPF, BGP, and IS-IS (design, optimization, and troubleshooting) - Advanced network security, including firewall design, segmentation, and threat mitigation - Cisco Identity Services Engine (ISE) for network access control and policy enforcement - Wireless network design and optimization for enterprise environments - TCP/IP protocol suite and deep packet-level troubleshooting - Network performance tuning and infrastructure redesign - Technical support and customer-focused problem resolution My certification portfolio demonstrates a strong commitment to continuous learning and multi-vendor expertise: - CCNA, CCNP Enterprise, CCNA Security - Cisco IT Essentials, CCNET - MikroTik (MTCNA, MTCRE) - Juniper (JNCIA, JNCDA) - Fortinet (FortiGate) - Huawei Certifications With a strong academic background from the Polytechnic University of Tirana, I bring both theoretical knowledge and real-world problem-solving skills to every project. I help businesses transform their networks into secure, efficient, and future-ready infrastructures. Whether you need full network redesign, routing optimization, MPLS deployment, or hands-on troubleshooting, I deliver solutions that are reliable, scalable, and aligned with your business goals. Let’s elevate your network performance, security, and reliability to the next level.
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