- Clouds: AWS, Azure, Google, Oracle, Yandex
- DevOps: Ansible/AWX, Terraform, Docker, Kuber, Jenkins, Github Actions, Gitlab CI/CD
- OS: Ubuntu/Debian, CentOS, OpenWRT, pfSense/OPNsense
- Routers: Cisco, Huawei, Juniper, Mikrotik, FortiGate, Aruba, Cambium
- Net: BGP, MPLS, L3VPN, L2VPN/VPLS, QoS, L2TP, GRE, VRRP, LACP, Firewalls
- Services: Zabbix, DHCP, DNS, iptables, RADIUS, HTTP, Ceph, SIP
- VM: VMWare, libvirt, qemu, VirtualBox, Proxmox
- VPN: IPSec, OpenVPN, Wireguard
- PL: Bash, Python