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On July 23, 2026 AWS GA’d the Durable Execution SDK for .NET (Amazon.Lambda.DurableExecution). Score your C# workflows against our durable-vs-Step-Functions matrix — most integration-heavy flows still belong in ASL.
When to keep Customer.io/Loops vs build journeys with EventBridge + Step Functions + SES — stream isolation, RFC 8058, Pro for DIPs, and a first-party journey architecture checklist.
The worst AWS bills still come from small systems with invisible failure modes. July 2026 refresh — SQS/Lambda retry storms, zombie resources, public AI endpoints, and Bedrock/AgentCore spend loops — plus the detection radar.
A technical guide to hybrid compute architectures that combine EC2, Lambda, Fargate, and Step Functions — with worked cost calculations, SQS buffering patterns, and decision frameworks based on invocation pattern rather than unit cost.
Step Functions is the AWS service most teams under-use until they need it badly. Patterns for sequential pipelines, parallel fan-out, error handling, human approval workflows, and the cost optimisations that keep state-transition bills predictable.