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API Gateway becomes your HTTP server, your routing layer defined in Flask/Sinatra/Express & co is implemented in API GW integration configuration and handling routed requests is implemented as Lambdas that process events from API GW.

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With AWS Lambda I try to avoid using API Gateway as it seems to me that is exactly where the lock-in occurs. Instead I have one catch-all route on API GW and I keep my routing layer in the app. This also makes it easier to run the app on dev without recreating the entire AWS environment

You can absolutely do that. Then you just need to do more custom work to enable route level observability and metrics.

If you work for any size corporation, they aren’t going to just switch their infrastructure because a developer said that they pinky promise the migration will be easy.

You’re always for all practical purposes locked into your infrastructure once your business grows.

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