CI/CD, infrastructure automation, and the culture of shipping reliably.
Every DNS record type for production: A, CNAME, MX, TXT, CAA, SRV. TTL failover math, SPF/DKIM/DMARC, GeoDNS, and DNSSEC.
Terraform in production: state locking, module design, environment directories, and CI/CD guardrails that prevent resource destruction.
Definitive kubectl reference: pod debugging, deployments, StatefulSets, RBAC, scheduling, Helm, and production troubleshooting flowcharts.
Docker reference: container lifecycle, image management, volumes, networking, and debugging tools for production systems.
60+ Linux commands for production debugging: processes, networking, kernel tuning, and the gotchas that trip up engineers.
Production Git reference: core workflow, branching, history rewriting, recovery, and advanced operations compressed into lookup tables.
How Kubernetes networking actually works — CNI plugins, kube-proxy iptables chains, the CoreDNS tax, and the debugging commands that find real problems.
Schema migrations on billion-row tables without downtime: expand-contract, pg_repack, gh-ost, blue-green migrations, and rollbacks.