Sergey S.
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Linux System Administrator
Professional Summary
Security-driven Linux System Administrator with over 15 years of experience architecting, hardening, and automating high-availability on-premises environments.
I specialize in the intersection of modern DevOps/GitOps orchestration and independent system deployment to ensure absolute system integrity, scalability, and resilience against evolving threats.
Full CV available upon request via email.
Infrastructure & Systems Stack
- OS: Debian, Ubuntu, CentOS (legacy), FreeBSD (legacy)
- Virtualization & Orchestration: KVM, LXC, Docker, Kubernetes
- Services & Networking: Nginx, Apache, HAProxy, OpenVPN, WireGuard
- Runtime Hardening: AppArmor, MAC, User Namespaces
- Security Monitoring & Auditing: Lynis, ClamAV, rkhunter, chkrootkit, Nmap, Burp Suite
- DevOps & Automation: GitLab CI/CD, Git, Ansible, Flux | Python, Bash, Zsh
- Diagnostics: tcpdump, iperf3, Wireshark/Tshark
Full-Stack Web Developer (legacy)
Professional Summary
Seven years of expertise in end-to-end digital product creation, balancing cohesive brand identity and aesthetic excellence with technically sophisticated architecture and full-cycle engineering.
Experience spans from interactive prototyping to production-ready «vanilla» stacks and CMS integration.
Today, my focus has shifted exclusively to transforming and optimizing existing web properties via technical SEO audits, semantic optimization, codebase refactoring, and performance tuning.
Full CV available upon request via email.
Tech Stack (legacy)
- Frontend: HTML/XML/XHTML, CSS, JavaScript, jQuery
- CMS & Frameworks: Jekyll, WordPress, phpBB, Joomla, vBulletin
- Design Tools: Adobe Photoshop, Illustrator, GIMP
- Documentation & Markup: Sphinx, Markdown, Liquid
- Productivity: MS Office Suite, Adobe Acrobat
Languages
- English Advanced
- Italian Intermediate
- Russian Native
- Ukrainian Advanced