Giorgi J.

Linux server breaks at 3am? Emails going to spam? I fix Linux servers fast and find the root cause so it doesn't come back. Postfix, DKIM/SPF/DMARC, Nginx, VMware/Veeam, DNS — 6+ years, LPIC-2 certified. Top Rated on Upwork. Specializing in Linux system administration and Linux server administration across all major distributions. What I work on: Linux Administration — Ubuntu, Debian, CentOS, AlmaLinux, Rocky Linux, RHEL — Server hardening, firewall (iptables/UFW/fail2ban), SSH lockdown, SELinux — LVM storage management, disk partitioning, filesystem tuning — Bash scripting, cron automation, system monitoring Mail Server & Email Deliverability — Postfix, Dovecot, Mailcow, Docker-based mail stacks — DKIM, SPF, DMARC configuration and troubleshooting — Email delivery to Gmail/Outlook, blacklist removal, spam reputation fixes — DNS records: MX, A, PTR, TXT — full mail infrastructure setup DNS & Network Infrastructure — BIND, Cloudflare, cPanel/WHM DNS management — Zone file configuration, propagation troubleshooting — Reverse DNS, domain migrations, SSL/TLS (Let's Encrypt, Certbot) VMware & Backup — VMware ESXi, vSphere administration — Veeam Backup & Replication — backup jobs, restore, DR planning — Proxmox VE, VM provisioning and migration Web Server & Database — Nginx, Apache — virtual hosts, reverse proxy, SSL termination — MySQL, MariaDB — installation, tuning, user management — Docker, Docker Compose — containerized service deployment Recent Upwork results: ✓ DNS zero-downtime A record migration — verified globally — 5★ ✓ MailCow setup diagnosis and fix — Postfix/email deliverability ✓ Docker-based open-source mail server setup from backup — 5★ ✓ VPS mail server DKIM/SPF/DMARC for Gmail delivery — 5★ ✓ Postfix + Rspamd email filtering and forwarding rules on Ubuntu VPS — 5★ ✓ Migrated multiple websites to Cloudflare Pages across GoDaddy/Hostinger/GitHub ✓ Kamailio custom build — SaaS API to PBX middleware integration ✓ Custom middleware — SaaS API to WebResponder VoIP integration — 5★ ✓ "Giorgi is that guy that finds a solution to your problem" — client review ✓ "Giorgi is a very talented developer with deep insights into VoIP telephony" — client review Available for one-time fixes, full server setups, and ongoing maintenance contracts. Send me your setup details and I'll respond within a few hours.