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lennart.hostettler@debian:~/

Security Engineer & Penetration Tester from Germany
CSS is bloat and fuck JavaScript

I don’t hate Bill Gates because he’s a reptilian lizard injecting 5G chips from the hollow earth β€” I hate him because he invented Windows.

Skills

Here's a brief rundown of my abilities. This list is intentionally concise and omits fluff.

  • > Red Teaming
  • > Linux
  • > DevOps & Automation
  • > Security Engineering
  • Certifications / Courses

    Experience

    2023 - Present
    Junior Penetration Tester & Security Engineer at SmartTECS Cyber Security
    As part of my role, I was responsible for conducting comprehensive penetration tests across various environments, developing robust IT emergency response plans, and supporting the implementation of ISO 27001-compliant information security management systems. I also designed and hardened Linux-based infrastructures (RHEL and Debian) and integrated as well as monitored network detection systems, including NIDS, AIDS, and HIDS, to enhance overall organizational security posture. I was actively involved in threat intelligence gathering and analysis to proactively identify, assess, and mitigate emerging risks.
    2020 - 2023
    Apprenticeship – Linux Administrator at SBE network Solutions
    Completed a vocational training as an IT Specialist for System Integration, with a strong focus on planning, deploying, and maintaining Linux-centric and hybrid infrastructures. Core responsibilities included managing Samba4 Active Directory environments, building containerized services with LXC, and automating system configurations using Puppet. Daily work involved deploying secure proxy services via Squid, implementing system monitoring and backup strategies, and troubleshooting complex issues in Debian- and RHEL-based networks. Gained deep experience in integrating open-source tools to create scalable, secure, and maintainable environments.

    Hobbies