Linux System Administrator

Delivered private VPN services for closed user groups by designing, deploying, and maintaining secure Linux-based VPN infrastructure. Focused on high availability, traffic stability, and secure remote connectivity for mobile and multi-device users. ● Deployed and administered OpenVPN, L2TP, and PPTP services on CentOS/Debian Linux servers, providing secure and reliable remote access for client devices. ● Maintained high availability and near-zero downtime through proactive system administration, service monitoring, patching, and configuration optimization. ● Monitored system load and network traffic using tools such as top, htop, iftop, and vnStat, and optimized performance using iptables, routing rules, and basic load distribution across services where applicable. ● Managed VPN user accounts, credentials, and access policies, including account provisioning, expiration, and revocation, using Linux user management, scripts, and service-level configuration controls. ● Troubleshot client connectivity issues through network debugging and log analysis, utilizing tools such as tcpdump, netstat/ss, journalctl, and OpenVPN logs to diagnose authentication, routing, and firewall-related problems.