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

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.