All major Linux distributions: CentOS, Debian, Ubuntu - Languages: Python, Bash, Java - Cloud Computing Services: AWS, fully managed by Terraform automation - Infrastructure: VMware vCloud Director, VMware vSphere + ESXi - Orchestration: Kubernetes, fully managed by Kops and Kubespray automations - Application management: Helm - Monitoring: Prometheus, Zabbix - Automation server: Jenkins, fully managed by jenkins-job-builder tool - Configuration Management & IT automation: Ansible - CDN & DDOS protection: Incapsula - Logz collection: Logz.io + Fluentd - Version control: Git - Code review: GitLab, Gerrit - Databases: PostgreSQL, VoltDB - Message brokers: RabbitMQ