Senior Linux System Administrator – 2nd-Level Support, Hosting

• Handle complex L2 tickets as part of day-to-day operations
• Perform in-depth troubleshooting at the application, system, and platform levels
• Manage challenging virtualization, HA, storage, firewall, VPN, performance, stability, and migration cases
• Coordinate and prioritize incidents and turn service disruptions into concrete improvements
• Further develop runbooks, escalation rules, minimum ticket data requirements, and support procedures
• Coach L1/L2 teams, review approaches, and share knowledge
• Take technical ownership and coordinate efforts during critical incidents

• In-depth knowledge of Linux and service stacks, including system behavior, load and failure patterns, and the side effects of changes
• Experience with web servers (e.g., NGINX, Apache), PHP runtimes, databases, caching layers, and reverse proxies (e.g., HAProxy, Traefik)
• Experience with typical hosting architectures such as application/database separation, replication, and clustering
• Experience with virtualized environments, HA concepts, and storage (e.g., Proxmox, KVM, Ceph, or comparable technologies)
• In-depth troubleshooting and resolution of complex incidents at the application, system, and platform levels
• Ability to consider dependencies and impacts on other systems
• Ability to develop colleagues technically, establish standards, and improve ways of working
• Good command of German
• Good command of English for customer communication, documentation, and communication with vendors
• A plus if you have it: Deep specialization in Proxmox/Ceph
• A plus if you have it: IaC/Ansible experience
• A plus if you have it: Firewall, VPN, and WAF experience (e.g., WireGuard, OpenVPN, iptables/nftables)
• A plus if you have it: Experience with complex migration projects
• A plus if you have it: In-depth monitoring and observability expertise (e.g., Checkmk, Prometheus)

• 100% remote
• Freedom to choose your hardware
• Linux setups explicitly welcome
• Home office allowance
• 30 days of vacation
• Professional development: Whether you want to move toward system administration, networking, or software development, we support you in pursuing the path that suits you best.
• A small team where everyone knows one another and no one gets lost behind ticket numbers