Hire the Best Certified Linux Professionals

Clients rate our Certified Linux Professionals
Rating is 4.8 out of 5.
4.8/5
Based on 8,561 client reviews
Hachani L.

Algiers, Algeria

$30/hr
5.0
36 jobs

What Makes Me Different ? (Top 10% on Upwork and 100% Job Success Rate since 2022) | ๐Ÿ›ก๏ธ 7+ Years in CyberSecurity, Application Security and Penetration Testing, Securing Multinational Companies. Experience across Technology , Travel-tech, banking, insurance, Healthcare, oil & gas, Technology and government. Experience Product Security, QA, DevSecOps, AWS security hardening, SAST/DAST pipelines, secure code review, infrastructure security, and vulnerability remediation across modern application stacks. ๐Ÿ’ผ Services Include : - Application Security & Penetration Testing - SOC 2 Type II Readiness Evidence & Hardening and Support - AWS Security ๐Ÿ“œ My Industry Penetration Testing | Application Security certifications : OSCP โ€“ Offensive Security Certified Professional OSWE โ€“ Offensive Security Web Expert ECIR โ€“ Certified Incident Responder ๐Ÿ† My Recent Multinational Cybersecurity Project Experience ๐Ÿ” Financial & Banking Sector ๐ŸŒ Technology & Digital Platforms ๐Ÿ›ก๏ธ Insurance Sector ๐Ÿ›ข๏ธ Energy & Oil Sector ๐Ÿ›๏ธ Government & Public Sector ๐Ÿฅ Healthcare Sector ๐ŸŽ“ Education & Universities Sector Penetration Testing | OSCP | OSWE | OSCE | OSEP | Web App Security | Network Security Testing | Mobile App Penetration Testing | API Security Testing | Security Assessment | Ethical Hacking | Application Security Testing | Bug Bounty | Red Team Assessment | White Hat Hacker | Vulnerability Scan | System Security Audit | Cloud Security Assessment | Security Compliance Testing | Risk Assessment | Cybersecurity Expert | Application Vulnerability Assessment | Server Hardening | Information Security | Security Audit Report | Cyber Risk Management | Secure Coding Review | Source Code Review | CI/CD Security Testing | Container Security (Docker/Kubernetes) | Cloud Security Testing | Threat Modeling | OWASP Top 10 | OWASP WSTG | SAST (Static Analysis Security Testing) | DAST (Dynamic Analysis Security Testing) | SAST (SAST Application Security Testing) | Mobile App Security | Web Security Audit | Security Configuration Review | Data Protection Testing | Infrastructure Security Testing | Application Security Automation | Burp Suite | OWASP ZAP | Metasploit | Nmap | Nikto | Wireshark | MobSF | Postman | Kali Linux | Nessus | Acunetix | OpenVAS | Invicti | Parrot OS | Hydra | web security | Nessus | Active Directory security Audit

  • Penetration Testing
  • Application Security
  • Vulnerability Assessment
  • Security Testing
  • Information Security Consultation
  • Security Assessment & Testing
  • Network Security
  • Information Security
  • Kali Linux
  • Web App Penetration Testing
  • Web Application Audit
  • OWASP
  • Network Penetration Testing
  • WordPress Security
  • Security Analysis
  • Cybersecurity Monitoring
  • Information Security Audit
  • Cloud Security
  • Cloud Security Framework
  • QA Testing
Gil A.

Lipa City, Philippines

$100/hr
4.8
115 jobs

Top Rated Plus, Experienced Network Engineer & Network Operations Manager With โญ๏ธ over a decade โญ๏ธ of experience in network engineering and operations, I bring a wealth of expertise to meet your business needs. As a seasoned Network Engineer, I have successfully handled clients across the globe, ensuring robust and efficient network solutions. โ–ถ๏ธŽ PROFESSIONAL BACKGROUND: Former Global Network Operations Manager at one of the largest BPOs worldwide. Led a team of network professionals to manage and optimize global infrastructures. โ–ถ๏ธŽ SPECIALIZATIONS: 1. โญ๏ธ Unifi/Ubiquiti: Cloud gateways, routers, switches, access points, and cameras. 2. Cisco: Routers, switches, access points, firewalls (ASA and FTD), ISE, SD-WAN, DUO, and Umbrella. 3. โญ๏ธ VPN Expertise: AnyConnect, Secure Client, Wireguard, OpenVPN, IPSec VPN, and SSL VPN. 4. Meraki: Access points, switches, and routers. 5. Palo Alto Firewalls 6. Sonicwall Firewalls 6. Linux Servers 7. Synology NAS โ–ถ๏ธŽ CERTIFICATIONS: โœ… CCNP โœ… CCNA Security โœ… Lean Six Sigma Yellow Belt โ–ถ๏ธŽ WHY CHOOSE ME? Proven track record of delivering high-quality network solutions. Extensive experience with a variety of network technologies and platforms. Committed to providing exceptional service and support to ensure your network's success.

  • Microsoft Azure
  • Cisco ISE
  • Cisco Certified Network Associate
  • Cloud Engineering
  • Ansible
  • Troubleshooting
  • Cisco Router
  • Cloud Implementation
  • Cisco Meraki
  • Cisco Certified Internetwork Expert
  • Cisco WLC
  • Cisco IOS
  • Cisco ASA
  • Cloud Architecture
  • Amazon Web Services
Md.Repon H.

Kushtia, Bangladesh

$25/hr
4.9
114 jobs

I am a certified cybersecurity professional specializing in Penetration Testing, VAPT, and Digital Forensics with extensive hands-on experience securing Web, Mobile, API, Network, and Server environments. I help businesses identify real-world vulnerabilities, investigate cyber incidents, recover critical evidence, and strengthen their overall security posture with clear, actionable, and professional reports. ๐Ÿ›ก๏ธ Penetration Testing & VAPT Services I provide manual + automated security assessments with detailed findings, including: โœ”๏ธ Web Application Penetration Testing (OWASP Top 10, 4000+ vulnerability checks) โœ”๏ธAPI Security Testing (REST, GraphQL, SOAP) โœ”๏ธ Mobile Application Security (Android & iOS) โœ”๏ธNetwork Penetration Testing (Internal & External) โœ”๏ธActive Directory Security Assessments โœ”๏ธCloud Security Reviews (AWS, Azure & Google Cloud) โœ”๏ธAuthentication & Authorization Testing โœ”๏ธBusiness Logic Vulnerability Assessment โœ”๏ธLLM/AI Application Security Assessment โœ”๏ธ Red Team & Adversary Simulation โœ”๏ธ Secure Configuration Reviews ๐Ÿ•ต๏ธโ€โ™‚๏ธ Digital Forensics & Cybercrime Investigation โœ”๏ธ Cybercrime Investigations & Incident Response โœ”๏ธ Malware Analysis โœ”๏ธ Data Recovery (deleted/corrupted files) โœ”๏ธ Forensic Imaging & Analysis (.E01, .RAW, .IMG, .OVA, etc.) โœ”๏ธ Log Analysis & Timeline Reconstruction โœ”๏ธ Email Fraud, Phishing & Spoof Analysis โœ”๏ธ Corporate Cybersecurity Consultation โœ”๏ธ Professional Forensic Reporting for Legal Use ๐Ÿ“„ Document Authenticity & Tampering Detection Physical Documents: โœ”๏ธ Ink & Paper Analysis โœ”๏ธ Watermarks, Indentations, Aging Patterns โœ”๏ธ Detection of Erasures, Alterations & Page Substitution Digital Documents: โœ”๏ธ Metadata Examination โœ”๏ธ File Signature Analysis โœ”๏ธ Detection of Hidden or Modified Content Handwriting & Signature Verification: โœ”๏ธ Pattern & Stroke Analysis โœ”๏ธ Comparison with Known Samples ๐Ÿ’ฌ Have Questions? Feel free to message me โ€” I reply quickly and provide free initial consultation.

  • Network Security
  • WordPress
  • Virus Removal
  • Penetration Testing
  • Information Security
  • Web Application Security
  • Malware Removal
  • Digital Forensics
  • Kali Linux
  • System Security
  • Cybersecurity Tool
  • Vulnerability Assessment
  • WordPress Malware Removal
  • Security Analysis
  • Metadata
Sajeeb S.

Sylhet, Bangladesh

$20/hr
4.9
68 jobs

I have been working as a Cybersecurity Specialist, Penetration Tester, OSINT, Private & Digital Forensics Investigator for the last 5 years & Iโ€™ve worked with almost 70+ Clients from 25 Countries. Iโ€™ve completed 200+ projects with them successfully. I am a skilled freelance in Penetration Testing, Vulnerability Assessments, Open-Source Intelligence (OSINT Investigation), Company Background Check, Social Media Investigation, Private Investigation, WordPress Malware Removal & Digital Forensics as well. Over the years I have conducted many investigations into background checks, scams, extortion, theft, and all sorts of other forms of cybercrime. I can call myself an expert in this field. I am a specialist in all sorts of digital investigations, such as finding people who do not want to be found, you can also contact me for investigations into people or companies if they are legit or not. What I Work On: โœ… Penetration Testing and Vulnerability Assessment โ€ข Web penetration testing โ€ข Android Penetration Testing โ€ข Network Penetration Testing โ€ข Vulnerability assessments โ€ข Software & Security Testing โœ… OSINT Investigation โ€ข Background Checking โ€ข Social Media Investigation โ€ข Personal Profile Analysis โ€ข Target's Photos, Videos, Previous Records Analysis โ€ข Location Tracking โ€ข Business and Assets Information โ€ข IP Investigation and Tracking โ€ข Dark Web Investigation & Monitoring โ€ข Any Private Investigation โœ… Digital Forensic โ€ข Criminal and arrest record โ€ข Target's Photos, Videos, Previous Records Forensic โ€ข Data Forensic and Recovery โ€ข Phishing Investigations โ€ข Cyber Forensic of all about cybercrimes โ€ข Malware and Keylogger Analysis โœ… WordPress Malware Removal โ€ข Remove Malware from WordPress Website โ€ข Fix WordPress errors and issues โ€ข Fix Hacked Website โ€ข WordPress website Migration, Backup & clone โ€ข Fix SSL Certification Issue If you choose to work with me, you will get: โ–ถ Maximum effort to resolve your case โ–ถ A discreet and professional investigation โ–ถ A basic report with all the findings โ–ถ All the care you need, even after the job is done. My Background: ๐Ÿ•ต๏ธโ€โ™‚โ€ Certified Ethical Hacker(CEH) from EC-Council ๐Ÿ•ต๏ธโ€โ™‚โ€ Certified Junior Penetration Tester(eJPT) from INE Security ๐Ÿ•ต๏ธโ€โ™‚โ€ Certified Google Cybersecurity Professional ๐Ÿ•ต๏ธโ€โ™‚โ€ Certified API Penetration Tester ๐Ÿ•ต๏ธโ€โ™‚โ€ Registered OSINT Analyst ๐Ÿ•ต๏ธโ€โ™‚โ€ Certified OSINT Expert ๐Ÿ•ต๏ธโ€โ™‚โ€ Certified Digital Forensic Investigator ๐Ÿ•ต๏ธโ€โ™‚โ€ Student of Computer Science and Engineering If you need any services donโ€™t hesitate to reach out to me. I am always ready to give you the best services. I look forward to hearing from you. Thanks! -Sajeeb

  • Cybersecurity Management
  • Penetration Testing
  • Vulnerability Assessment
  • WordPress Security
  • WordPress Malware Removal
  • Open Source
  • Company Research
  • Market Research
  • Investigative Reporting
  • Digital Forensics
  • Ethical Hacking
  • Legal Research
  • Python
  • Cybersecurity Monitoring
  • NIST Cybersecurity Framework
Noah B.

Madison, Alabama

$25/hr
5.0
4 jobs

I help businesses and homelab enthusiasts deploy secure, reliable environments using Docker, reverse proxies, VPNs, and automation. My experience includes designing and securing self-hosted infrastructure, troubleshooting servers, automating deployments with Bash/Python, and implementing security best practices inspired by real-world security experience. I can help with: โ€ข Docker & Docker Compose deployments โ€ข Traefik / NGINX reverse proxies โ€ข WireGuard VPN setup โ€ข Linux server administration โ€ข Security hardening โ€ข Bash automation โ€ข Infrastructure troubleshooting โ€ข Self-hosted applications โ€ข And More (I can always learn) I believe good infrastructure should be secure, documented, and easy to maintainโ€”not held together with quick fixes. If you're looking for someone who communicates clearly and treats your infrastructure like it's their own, I'd be happy to help.

  • Linux
  • Docker
  • Docker Compose
  • Debian
  • Ubuntu
  • NGINX
  • VPN
  • SSH
  • Bash
  • Git
  • Cloudflare
  • System Administration
  • Unix System Administration
  • IT Infrastructure
  • Security Infrastructure
  • System Hardening
  • Containerization
Foysal H.

Dhaka, Bangladesh

$29/hr
5.0
51 jobs

I help startups, SaaS companies, fintech organizations, healthcare providers, and enterprises identify and eliminate security vulnerabilities before they become data breaches. With 10+ years of offensive security experience and more than 200 successful penetration testing engagements, I provide manual, risk-focused security assessments that uncover vulnerabilities automated scanners often miss. My assessments follow industry-recognized methodologies, including OWASP Testing Guide, OWASP ASVS, OWASP MASVS, PTES, NIST SP 800-115, and MITRE ATT&CK, delivering actionable findings that improve your security posture and support compliance initiatives. Core Expertise โ€ข Web Application Penetration Testing (OWASP Top 10) โ€ข API Security Testing (REST, GraphQL, SOAP) โ€ข Mobile Application Security (Android & iOS) โ€ข Network Penetration Testing (Internal & External) โ€ข Active Directory Security Assessments โ€ข Cloud Security Reviews (AWS, Azure & Google Cloud) โ€ข Authentication & Authorization Testing โ€ข Business Logic Vulnerability Assessment โ€ข LLM/AI Application Security Assessment โ€ข Red Team & Adversary Simulation โ€ข Secure Configuration Reviews Industries Served โ€ข Financial Services & FinTech โ€ข Healthcare โ€ข SaaS Platforms โ€ข E-commerce โ€ข Government โ€ข Telecommunications Deliverables Every engagement includes: โœ” Executive Summary for management โœ” Detailed technical report โœ” CVSS-based risk ratings โœ” Step-by-step Proof of Concept โœ” Remediation guidance โœ” Security consultation โœ” Complimentary revalidation after remediation Compliance Support My assessments help organizations prepare for or strengthen compliance with: โ€ข ISO 27001 โ€ข SOC 2 โ€ข PCI DSS โ€ข HIPAA โ€ข OWASP Certifications OSCP+ โ€ขOSCPโ€ข CREST โ€ข LPT Master โ€ข CRTP โ€ข C|PENT โ€ข CEH โ€ข ISO 27001 Lead Auditor and Lead Implementor I believe penetration testing should provide clear business valueโ€”not just vulnerability lists. Every assessment is tailored to your environment, your threat model, and your compliance requirements, with practical recommendations your team can act on immediately. If you're planning a new product launch, preparing for an audit, or simply want confidence in your security posture, let's discuss your scope. I'll provide a clear testing plan, timeline, and deliverables before the engagement begins.

  • Ethical Hacking
  • Cryptography
  • Penetration Testing
  • Network Penetration Testing
  • Web App Penetration Testing
  • Cybersecurity Tool
  • Kali Linux
  • Vulnerability Assessment
  • Information Security
  • Governance, Risk Management & Compliance
  • AI Governance
  • OWASP
  • Security Testing
  • ISO 27001
  • Red Team Assessment
  • AI Security
  • Application Security
  • Security Operation Center
  • Digital Forensics

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