Linux System Administrator (Senior) - 2nd-Level Hosting Support

Stack

Responsibilities

• ▹Handle more complex L2 tickets day to day, with deep root-cause analysis at application, system and platform level
• ▹Carry demanding topics such as virtualization, HA and storage cases, firewall and VPN, performance and stability problems, complex migrations
• ▹Coordinate incidents: prioritize, hold the threads together and derive concrete improvements from outages
• ▹Define standards: develop runbooks, escalation rules, minimum ticket data and support procedures
• ▹Strengthen the team: coach L1/L2, review procedures, share knowledge

Requirements

• ▹Deep Linux and service stack know-how: system behavior, load and failure patterns, side effects of changes
• ▹High-level web and mail stack experience: web servers (for example NGINX, Apache), PHP runtimes, databases, caching layers and reverse proxies (for example HAProxy, Traefik), including typical hosting architectures such as app/DB separation, replication or clustering
• ▹Platform and virtualization competence: virtualized environments, HA concepts and storage (for example Proxmox, KVM, Ceph or comparable)
• ▹Deep troubleshooting of complex outages at application, system and platform level, considering dependencies and effects on other systems
• ▹Technical leadership and communication: develop colleagues, set standards and improve ways of working
• ▹Good German and good English for customers, documentation and vendor communication

Nice to have

• ▹Deep Proxmox/Ceph specialization
• ▹IaC/Ansible
• ▹Firewall, VPN and WAF experience (for example WireGuard, OpenVPN, iptables/nftables)
• ▹Complex migration projects
• ▹Monitoring and observability depth (for example checkmk, Prometheus)

Soft skills

What we offer

• ▹100% remote, free choice of hardware, Linux setups explicitly welcome
• ▹Home office allowance
• ▹30 vacation days
• ▹Professional development toward system administration, networking or development
• ▹Small team where people know each other