Azure Functions Expert patterns for Azure Functions development including isolated worker model, Durable Functions orchestration, cold start optimization, and production patterns. Covers .NET, Python, and Node.js programming models. Modified: output-binding and operational semantics review. Cloud provisioning/deployment and billable tests require the intended account, budget and authorization. Function keys are shared secrets, not per-user/tenant authorization; protect status/control URLs and do not log keys or payloads. Durable orchestrators must be deterministic, with I/O in activities. Det…