Automation/IaC: Ansible, Terraform, Helm, Helmsman, Vagrant CI/CD: Jenkins, Gitlab CI, GitHub Actions, Travis CI Virtualization: Docker, KVM (oVirt), OpenStack, VMware, Proxmox Clouds: AWS, GCP, Alibaba Cloud, DigitalOcean, Kubernetes (GKE, AKS, BM), Heroku, OpenStack Containers: Kubernetes (GKE, EKS, Kops, kubespray, minicube), Docker, Docker Compose Network/Systems Security and hardening OS: Linux (Ubuntu, Debian, SLES, OpenWRT, Embedded), Microsoft Windows basics Monitoring and alerting: Prometheus (Thanos), Zabbix, Nagios, Grafana, Elastic Stack Web servers: Apache, Nginx, Tomcat Databases: MySQL/MariaDB, MongoDB, etcd, InfluxDB Programming/scripting: BASH, Python, Go, groovy, C, C++, Java, Assembler { Tools: Git (GitHub, BitBucket, Gitlab), Jira, Confluence