Deep understanding of containerization technologies, with a focus on Docker and Docker Compose , including image building and hardening, container networking and storage, runtime isolation (namespaces, cgroups, seccomp, capabilities, rootless containers), and securing images and registries. Provisioning and Configuration Management: Build and maintain automated, reproducible provisioning and installation frameworks (Ansible, Chef, etc.) that take hardware and cloud hosts from bare metal to a hardened, mission-ready baseline, including in air-gapped and disconnected environments.