We are seeking an experienced System Administrator (freelancer/consultant/agency) to deploy, secure, and optimize the production backend for A Platform. You will follow a comprehensive, architecture and be responsible for a zero-downtime, robust environment that maximizes speed, privacy, compliance, and scalability . Key Deliverables • Deploy and harden two VPS (Auth mini-VPS & Backend Dedicated Server; offshore, adult-friendly hosting) • Configure advanced firewall, SSH key auth, fail2ban, WireGuard VPN (VPS1 <-> VPS2) • Install, secure, and optimize : • Node.js backend app (Express) • Nginx as reverse proxy/front • MongoDB, Redis (secure config) • Docker (if needed) • Set up Cloudflare + BunnyCDN (DNS, proxy, DDoS) • Integrate Google, Twitter, Facebook OAuth login (OAuth2 Proxy or similar) • Configure Wasabi storage for videos (secure bucket, API keys) • Set up Let’s Encrypt SSL (auto-renew) • Strengthen logging, updates, monitoring (fail2ban, Prometheus/Grafana, logrotate) •Support system API endpoints, HTTPS/SSL across all layers • Implement best security practices; minimize attack surface