Senior Linux Server Administrator — Long-Term (Ubuntu / Plesk / Docker / PrestaShop) Overview I am looking for a reliable and experienced Linux server administrator to take real ownership of live production infrastructure. The goal is long-term cooperation with one technically strong person who communicates clearly, works pragmatically, and takes responsibility for the systems they manage. Infrastructure • VPS 20 (Contabo) — n8n, Docker, Nextcloud, Vikunja, Uptime Kuma • VPS 30 (Contabo) — Plesk, WordPress, Email (Postfix, Dovecot, SpamAssassin) • VPS 30 (Contabo) — PrestaShop live shop (Nginx + Apache, Cloudflare, PHP-FPM) • Dedicated Backup Server (Interserver) — automated backups, Google Drive, NFS Your First Task — System Cleanup & Security Takeover The previous administrator left the systems in a partially configured and insecure state. Before anything else, you will: Access Cleanup • Remove all SSH keys, SFTP users, and credentials of the previous administrator across all servers • Remove any email accounts or system accounts created by or forwarding to the previous administrator • Rotate all relevant passwords (root, SSH, Plesk, SFTP, database) and confirm with documentation Open Technical Items to Resolve • Cloudflare: 2 domains were started but not finished — in total 8 domains have to be set up and configured • Cloudflare: fix caching configuration that is causing instability on live websites • OpenVPN Community Edition: full fresh installation; provide 4 .ovpn certificates — owner (full access), PrestaShop developer (restricted), Member Area developer (restricted), yourself (temporary — revoked on project completion) • SSH: restrict access on all servers — must not remain open to Anywhere (0.0.0.0/0) • Cron jobs: fix broken cron on backup server (/home/en8en/backup missing); notifications only on failure, not on success • SFTP: screenshot per server confirming active users — only PrestaShop developer and Membo developer • Email server: written proposal for migration from MX Guarddog to Rspamd (open source), including user experience impact, then implementation • PrestaShop server: complete remaining optimizations (e.g. TTFB currently 4.4 seconds) • Backup monitoring: notifications only on failure — applies to all servers Ongoing Responsibilities • Manage Ubuntu production servers, Plesk environments, WordPress and PrestaShop setups • Keep systems updated, patched, and secure; manage domains, DNS, SSL, and email configurations • Manage developer access (SSH / SFTP); diagnose issues independently using logs and monitoring • Understand backup systems and restore procedures; work carefully on live systems without downtime What Matters To Me • Reliability — do what you say, confirm only what is actually done • Proactive mindset — identify and communicate problems before they become incidents • Propose solutions, align with me before acting, then execute cleanly • No delegation — you must be the person doing the work; no third-party access without explicit written permission • Long-term cooperation — I am not looking for a one-time fix Working Model • Fixed price for Task 1 (system cleanup + all open technical items) • Ongoing work after Task 1: freelance / hourly — estimated 5–10 hours per month • All larger tasks discussed and agreed before execution • Updates submitted as Word documents with screenshots as proof of completion Please Include In Your Application • Short summary of relevant experience and similar infrastructure managed • General availability and typical response times • Confirmation that you are the person doing all the work • Your fixed-price offer and estimated hours for Task 1 • Your hourly rate for ongoing work after Task 1