Mladen A.

15-year experience in following areas: Linux system administration, NGINX web server administration, VPN setups based on OpenVPN, Haproxy load balancing administration, Xenserver, XCP-NG and KVM virtualisation setups, rich experience with TCP/IP network stack, Linux Bash scripting, enhancing server security using IPTables and NFTables traffic filtering. Regarding the application layer I am mostly involved with deploying massive scale PHP (+NGINX+Redis+memcached+PgSQL) applications, and also having solid experience working with web video streaming projects using ffmpeg software stack. Certificates: Cisco Systems CCNA/CCNP. Expertize in following products and technologies: Debian Linux administration, Centos administration including different OS version installation, software installation, maintenance and update, system troubleshooting, system performance fine tunning according to the application requirements, building reliable backups, preparing recovery procedures, ensuring high availability for various applications. Networking administration for different network vendor products, Mikrotik, Linux networking, Linux bash scripting. Senior-level experience working with the Zabbix monitoring system, and basic experience working with Cacti and PRTG. Middle-level experience working with Nginx web server setups, including web server administration for different backend PHP applications including cache optimisations and proxy/load-balancing setups. Middle-level experience working with databases: PgSQL and MySQL, including installation on various OS systems, DB creation and user privileges administration, basic troubleshoting, backup and building database recovery procedures.