Danielle Heberling

I Rewrote My Step Function as a Durable Function

The author rewrote a serverless weather‑checking workflow from AWS Step Functions to the newly announced Lambda Durable Functions, publishing both implementations on GitHub. Both versions perform identical tasks—polling OpenWeatherMap every ten minutes and updating a static S3 site—but the coding experience differs markedly. Step Functions rely on JSON/YAML state machines with visual debugging, while Durable Functions let developers write the flow directly in TypeScript. A key deployment snag was the need for a qualified Lambda ARN when using EventBridge Scheduler with Durable Functions.