Senior System Engineer (Linux) | IT Security | Network Engineering
Salzburg, Austria
Understanding technology in full detail has been my passion since childhood. Fascinated by complex IT infrastructures of enterprise companies, I gained experience across the full stack — from datacenter and hosting to user access and everything in between. Seeing the whole picture is what drives me the most, along with my passion for innovation.
| Nationality | German |
| IT Experience | Since 2008 |
| Languages | German (native), English (business-fluent), French (school knowledge) |
| mail@gebauer.services | |
| felix-gebauer-28994017a | |
| GitHub | deadRabbit92 |
02/2022 - present
- Lifecycle management of ~300+ Linux servers using Ansible / VMware vSphere / vSAN, 90% on-premises
- Storage management with LINSTOR for distributed replicated block storage
- Fully automating ACME certificate deployment using Ansible and Cloudflare DNS API on LetsEncrypt and ZeroSSL
- Automating bulk changes in multiple Cloudflare accounts using Cloudflare API + Bash / Python
- Cloudflare Magic WAN implementation and WAF management
- Migrating end-of-life systems (Debian 9/10, CentOS 6/7)
- Containerizing applications with Docker / Docker Compose / Docker Swarm, later migrating to Kubernetes (Talos OS, Cilium CNI, Multus for static IPs) across multiple clusters for improved scalability
- Load balancing and implementing HA using HAproxy / Traefik
- Creating hardened Linux system images (implementing CIS recommendations)
- Managing Postfix / Dovecot servers, troubleshooting, securing and patching
- Setting up and running a colocation datacenter in Salzburg (Conova)
- Running central firewall ruleset using Check Point Identity Awareness + maintenance and troubleshooting
- Setting up on-premises Git repository using Gitea and Docker
- Building custom Docker images and creating Git Actions
- Creating and managing an Atlassian Jira + Confluence Datacenter on-premises HA setup using PostgreSQL and Docker Swarm
02/2021 - 01/2022
03/2017 - 01/2021
08/2015 - 01/2017
11/2014 - 07/2015
12/2012 - 06/2013
04/2012 - 07/2012
09/2011 - 02/2012
- IT Systemelektroniker — Technical University of Berlin (09/2008 - 08/2011)
- Advanced Technical Certificate — OSZ-IMT, Professional High School for Computer Science (08/2013 - 07/2014)
- CCNA (Cisco Certified Network Associate)
Linux Server Administration, Windows Server, VMware vSphere, Ansible, Docker, Docker Compose, Docker Swarm, Proxmox
Network Design & Planning, Firewall Management (Check Point), Cloudflare (WAF, Magic WAN, DNS API), IT Security & Penetration Testing, VPN, Load Balancing (HAproxy, Traefik)
Git, Gitea, Jira, Confluence, PostgreSQL, Postfix, Dovecot, LetsEncrypt, ZeroSSL
Bash, Python, Ansible Playbooks
After migrating from Windows to Ubuntu as my daily work OS, I needed a replacement for mRemoteNG — my main tool for SSH session management and RDP. Built a web-based, PWA-supported 1:1 replacement using Claude Code that I now use every day and keep improving.
Building a fully customized, mobile-first PWA web application for a local fitness studio — covering ERP, scheduling, member management, and day-to-day operations. The app enables gym customers to easily book their own appointments through a self-service interface. Built with the help of Claude Code, packaged as a custom Docker container image, and fully automated in deployment for seamless updates and maintainability.
Passionate about open-source software, on-premise infrastructure, cloud-to-on-premise migration, and reducing vendor dependency. Exploring and contributing to self-hosted alternatives in my free time.
- 15+ years of experience in IT, with deep expertise in Linux systems engineering
- 10+ years of experience as a Windows administrator
- 10+ years of experience in 2nd and 3rd level support
- Specialized in large company networks and datacenter environments
- Strong knowledge of virtualization and server/storage hardware
- Experienced in administrating complex IT environments
- Mentoring and training junior colleagues
Salzburg, Austria