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I am a professional passionate about technology, with experience in backend development and IT infrastructure. I began my career as an intern in Java development and MySQL database, working on code analysis and database migration for major retail clients. Afterwards, I worked for two years at Kyndryl as a systems administrator, focusing on infrastructure, technical support, and monitoring corporate servers. I speak English fluently and recently had an international experience in Portugal, which strengthened my global perspective and adaptability. I am currently undergoing a career transition: I work in the commercial area, but my goal is to return to the technology sector, especially in roles related to infrastructure, technical support, or backend development. I am always eager to learn and open to opportunities — whether onsite, hybrid, or remote. 🧠 Skills ● Systems Administration ● IT Infrastructure ● Java ● MySQL ● Linux ● Windows Server ● Technical Support ● Troubleshooting ● Fluent English ● Communication ● Teamwork ● Customer Service

I’m an eJPT-certified Penetration Tester focused on web, API, and internal network security. I actively practice through private bug bounty programs and hands-on labs/CTFs, and I’m currently studying for the DCPT certification. What I can help you with: - Web & API pentesting (OWASP Top 10): auth/session issues, IDOR/BOLA, injections, XSS, access control flaws - Internal network / AD security reviews: enumeration, attack paths, weak configs, credential exposure - Vulnerability assessment + validation: prioritize what’s exploitable and what truly matters - Actionable reporting: clear reproduction steps + remediation guidance your team can implement Tooling I commonly use includes: - Burp Suite - Caido - Nmap - Metasploit - ffuf/gobuster - Nessus - sqlmap - BloodHound - CrackMapExec - hashcat - Wireshark My background includes infrastructure and security operations (Linux/Windows, firewalls, VPNs, IAM/AD), which helps me test realistically and communicate fixes in a practical way. I also hold LPIC-1 - Linux Administrator (secondary to my offensive security track).

Over 7 years of dedicated experience as a Linux administrator. Proficient in working on projects and expertly troubleshooting/managing various aspects, including: Linux distributions: Debian, Ubuntu, CentOS, AlmaLinux. Virtualization technologies: VMware, Proxmox, Xenserver, KVM/Libvirt. Hosting environments: WHM/cPanel. Cloud services: AWS EC2, RDS, S3, and Route 53. Network services expertise includes: DNS management: Record configuration, zone transfers, security enhancements (SPF, DKIM, DMARK) to ensure mail servers send/receive mail without triggering spam filters. VPN setup: Efficiently establish, manage, and troubleshoot OpenVPN and IPsec configurations. Mail server setup: Proficient in configuring Exim or Postfix, Dovecot, and MX records. Linux services mastery: Skilled in managing BIND9, Exim4, Postfix, Dovecot, OpenVPN, Squid, Apache2, Nginx, and Samba4. Proficient in deploying iptables and various packages for effective firewalling. Scripting capabilities: Adept with both Bash and Python scripting languages. Network troubleshooting: Skilled in using tools like Wireshark, TCPdump, and others for accurate diagnosis. Firewalls proficiency: Expertise with SonicWall, Sophos, FortiGate, NethServer, PfSense, and MikroTik. SSL certificates management: Able to generate certificates using Let's Encrypt and effectively manage them with Certbot. SSH hardening: Proficient in generating public/private keys for SSH and fine-tuning configurations. Users/groups management: Skilled in efficiently managing user accounts, groups, and permissions. Linux clusters: Competent in setting up and managing Linux clusters. Storage management: Experienced in managing storage with LVM technology.

⚡️⚡️⚡️TOP Rated PLUS Upwork Freelancer ⚡️⚡️⚡️ ⚡️Security Assessment ⚡️Active Directory ⚡️DNS ⚡️GPO ⚡️Exchange Server ⚡️Zimbra⚡️pfSense⚡️Cisco⚡️Hyper-V ⚡️Vmware ⚡️ M365 ⚡️O365 ⚡️Exchange Online ⚡️BGP⚡️Kaspersky Security Center⚡️Sharepoint ⚡️OneDrive ⚡️Skype ⚡️Azure ⚡️AWS ⚡️ Backup Solution ⚡️Linux ⚡️MSP ⚡️Proxmox⚡️Sonicwall⚡️Ubiquiti You have just found an outstanding networking Expert with 20+ years of hands-on experience! I am a TOP Rated Upwork Freelancer, which means that I work online to deliver consistent, high-quality, impactful results for my Upwork clients. I do my best to provide excellent service to my clients. I also have extensive experience with Cisco, HP networking hardware and technologies, Virtualization (Vmware), Firewalls, Zimbra, pfSense, Microsoft Exchange, and Microsoft Servers Certifications: * Palo Alto Accredited Configuration Engineer * CCNA - Cisco Certified Network Associate * MCSA - Microsoft Certified Systems Administrator * 3Com Certified Enterprise LAN Expert * HP Certified Instructor * HP AIS Network Infrastructure Spamassassin, Zimbra, Microsoft 2012 2016 2019 Servers, VMware, Cisco, router, switch, firewall, Microsoft Exchange, McAfee EPO, Security, Sonicwall, pfSense, Proxmox, DFS, Active Directory, DNS, Active Directory, Palo Alto, Hyper-V, CCNA, Sonicwall, Linux, Kaspersky, ESET.

I am a DevOps Engineer and Cloud Architect, my roles are design and implement applications based in cloud providers or hybrid infrastructure. My strongest skills are (but not limited to): - Cloud (AWS/Azure/GCP/OCI) - IaC, CI/CD - Docker, Kubernetes, Openshift

As an Infrastructure Administrator, I bring a wealth of experience in managing and maintaining complex IT systems. My technical expertise and leadership skills have been honed over the years in various roles, from system administration and network engineering to project management. I have a strong understanding of various operating systems including Windows, Linux, and macOS, as well as a wide range of technologies including virtualization, VoIP, storage, network, and security. I am also familiar with industry best practices, and I'm no stranger to frameworks such as ITIL and COBIT. My key strengths include: Proactive monitoring, troubleshooting and resolving technical issues, ensuring the smooth running of IT systems and services. Managing and maintaining servers, storage, and networks, ensuring they are configured to industry best practices. Managing and maintaining virtual environments, including VMware and Hyper-V. Managing and maintaining backup and disaster recovery solutions. Managing and maintaining security solutions, including firewalls and security appliances. Managing and maintaining Windows and Linux servers. I am a team player with excellent communication skills, able to work effectively with both technical and non-technical staff. I am also passionate about learning new technologies and staying up-to-date with industry developments. I am confident that my skills and experience make me an excellent candidate for your job, and I am excited about the opportunity to contribute to your success.