Distributives: Debian, CentOS, FreeBSD
Configuration apache, nginx, openresty (writing lua modules)
Package distribution: rpm, deb
Proxmox KVM virtualization
RDBMS: MariaDB, Mysql, MongoDB
Monitoring: Nagios, Check_mk
DNS: PowerDNS, Bind
Debugging and Profiling C++, PHP applications
Advanced skills with Atlassian products (Jira, Confluence, Stash)
Jira-Nagios integration, Confluence-Confluence documents sync
QA tools development,
CI&CD: TeamCity, fabric, phing, rocketeer, capifony
Common skills in ansible, docker, vagrant