Senior System Administrator

We're hiring a seasoned Senior Sysadmin to take full ownership of our server infrastructure. This is a hands-on, no-handholding role — you'll manage everything from bare metal to production services. About us We run open-source infrastructure on Proxmox + Ubuntu, with TP-Link Omada for networking. We value engineers who build things properly, automate everything, and own their stack end-to-end. What you'll own

Linux systems administration (RHEL/Debian family) — advanced level Networking equipment configuration (Cisco, HP ProCurve, TP-Link Omada) Mail stack management (Postfix / Dovecot / Exim + anti-spam) Web servers (NGINX / Apache) — advanced Database servers (PostgreSQL, MySQL/MariaDB) — advanced; MSSQL/Oracle basic Virtualization: Proxmox, KVM, QEMU, VMware Identity & access: LDAP, Kerberos, NIS, SSO Firewall & network security, including antivirus gateways HA/clustering and high-performance systems Bash scripting and automation Basic HP-UX / Solaris / BSD / Windows (PA-RISC, Itanium)

You must have

Owned and operated production infrastructure solo — bare metal / VMs (10–30+ physical or virtual servers) with high container density (50–200+ LXC/Docker containers across multiple roles) Built a full mail stack from scratch — not "we used Exchange" Real incident response experience — outage story, root cause, fix, prevention Linux hardening from memory: SSH, firewall, sysctl, auditd, fail2ban Strong preference for open-source tooling throughout

You won't be a fit if

You've only worked in cloud-managed or GUI-only environments Your answer to an outage is "reboot and see" You've never touched a mail server outside of M365/Exchange

Role details 📍 Remote 🕐 Full server management responsibility 🔧 Heavy open-source stack Interested? Apply below or DM me directly. We move fast — expect a technical interview, not a tick-box exercise.