06/22/2026 updated
MZ
partially available
info: Available evenings and weekends
Linux Systems & Infrastructure Engineer | Security | Troubleshooting | Python/Bash | Docker
Madrid, Spain
Only remote
Bachelor's Degree in Cybersecurity & Ethical Hacking (MSMK University, 2023-2026)About me
Linux-focused infrastructure and security engineer with strong troubleshooting, SSH, Bash/Python automation, Docker and systems debugging experience. Interested in remote freelance projects involving Linux servers, security hardening, networking, automation and unusual technical problems.
Secure Shell (SSH)Penetration TestingBash ShellUbuntu (Operating System)Debian LinuxLinuxPython (Programming Language)Linux AdministrationLinux DistributionLinux ServersLinux SupportMachine LearningNGINXLinux ContainersScripting
Linux Systems & Infrastructure
Hands-on experience across multiple Linux distributions, including Arch Linux, Ubuntu/Debian-based systems, Fedora/RHEL-style environments, and ARM Linux/NAS systems. Strong terminal workflow with SSH, package managers, systemd, logs/journalctl, permissions, filesystems, networking tools, service debugging and system troubleshooting. Comfortable working with both GUI and headless Linux environments.
Troubleshooting & Systems Debugging
Strong interest and practical experience in diagnosing unusual technical problems across Linux systems, services, networking, authentication, dependencies and configuration layers. Able to investigate issues through logs, command-line tools, reproducible testing, technical evidence collection and clear documentation.
Security & Offensive Security
Professional background in offensive security, penetration testing, adversary simulation, vulnerability research and Linux-based security testing. Security-minded infrastructure approach, including hardening awareness, vulnerability analysis, responsible disclosure, incident-style investigation and technical reporting. Familiar with tools such as Wireshark and Burp Suite.
Automation & Scripting
Development of automation scripts and internal tooling using Python, Bash, Go and C/C++. Experience creating reproducible workflows, command-line pipelines, technical research tooling and scripts for assessment, troubleshooting, reporting and workflow acceleration.
Docker & Infrastructure Workflows
Practical experience with Docker and container-based workflows, including deployment scripts, reproducible setup steps, technical documentation and troubleshooting of Linux-based services.
Networking & Remote Access
Experience with SSH, Linux networking tools, DNS troubleshooting, routing concepts, firewall awareness, VPN/tunnel debugging, service connectivity checks and remote server administration workflows.
AI, ML & Agent Systems
Experimentation with AI agent systems, local automation agents, command discovery, tool analysis and AI-assisted technical workflows. Python programming coursework completed in 2023 and Machine Learning specialization completed in 2024. AI/ML is a complementary area, mainly applied to automation, research and workflow improvement.
Development & Version Control
Use of Git/GitHub for version control and project management. Public projects focused on security tooling, encryption concepts, obfuscation experimentation, reproducible technical research and systems-oriented problem solving.
Preferred Project Types
Remote freelance or part-time projects involving Linux servers, infrastructure troubleshooting, SSH-based administration, security hardening, automation, Docker, networking, VPN/certificate issues, system debugging, documentation and unusual technical investigations.
Experience
Professional experience0 - 5 years
Freelancer since2026
Languages
EnglishFluentSpanishNative speaker
Project history
Execute penetration testing, adversary simulation, and technical security assessment activities across professional client environments. Install, configure, test, and troubleshoot Linux-based tools following project requirements, technical procedures, and confidentiality constraints. Develop internal automation and assessment tooling using Python, Go, Bash, and C/C++ to improve repeatability, evidence collection, and analysis quality. Investigate technical issues through logs, command output, network behavior, system configuration, browser tooling, and reproducible test evidence. Apply automation and AI-assisted techniques to improve assessment workflows, technical research, documentation, and reporting quality.
Supported offensive security engagements, penetration testing tasks, adversary simulation work, and technical security research. Built scripts and internal tools to assist Linux-based testing, analysis, workflow acceleration, evidence collection, and quality control. Worked primarily in Linux environments, combining independent troubleshooting with careful documentation and review-driven delivery.