• Engineered and maintained secure, high-performance VPN solutions using diverse protocols, including OpenVPN, IKEv2, and Hysteria2, to meet stringent security and performance requirements.• Developed, automated, and optimized system configurations and deployment processes using Ansible, achieving improved consistency and reduced deployment times.• Tuned and debugged the Linux networking stack to enhance VPN performance and troubleshoot connectivity issues, ensuring seamless user experience and reliability.• Contributed to DevOps tasks, gaining hands-on experience with Kubernetes for container orchestration and service scalability.• Designed and maintained CI/CD workflows to streamline development processes and improve release quality.• Managed version control practices to ensure code integrity and collaborative workflow across teams.• Monitored system performance and health using a suite of monitoring tools to proactively identify and address issues.• Configured AWS Route 53 for DNS management to support scalable and reliable application infrastructure.

Works as network engineer and system administrator in Service Provider Company.

Main responsibilities was core network design, troubleshooting and network improvement.

Also my job was to create and manage different sorts of monitoring systems.

Monitoring was based on such software like Prometheus/Grafana stack, LibreNMS, Cacti, pmacct/kafka/ClickHouse stack.

Also I was responsible to manager different services like VoIP, CRM, Billing system and other software.

Got good experience with high load Nginx setup with thousands of clients.

Also got successful result in implementing BRAS/BNG system based on Juniper MX series and open source billing.

I have successful experience with writing database migration between to different billing systems on Python.