Cloud
Architecture, configuration, migration choices, cost and operational optimisation.
Security and hardening
Practical controls, secure defaults, vulnerability reduction and defensible exceptions.
Reliability and resilience
Failure modes, recovery paths, dependencies, observability and verification.
Infrastructure and platforms
Operating systems, networks, virtualisation, automation, data services and the boundaries between them.
Operational readiness
Go-live blind spots, monitoring coverage, runbooks, ownership and recoverability.
Cross-domain troubleshooting
Situations where every specialist explanation sounds reasonable but the complete result still does not add up.
A list is only a set of examples
You may not see your platform, language or product named here. That does not automatically make the problem irrelevant. My strongest work often begins at the hand-offs between technologies, teams and expectations.