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I've built lots of things like this working at AWS. I probably would have used ECS instead of Fargate, S3 and S3 events instead of EFS, and CW Events instead of EventBridge for simplicity sake, but the "gist" of what he is trying to do is pretty sane and this is what a real-world combination of building blocks would look like. If it were me I'd also try to find a way to modify WGRIB2 to run entirely in Lambda and get the costs down.

Most architecture look complicated when include everything. He includes the load balancer. It would look simpler as VM but then all the complexity is the things running on VM.

Also, much of the complexity is from pulling from data sources. Lots of apps are just the web site and database, but weather app needs the complexity. I bet EventBridge has some important purpose.

Agreed. Guy above doesn't know how to save money or use resources efficiently in the cloud...