We use what might be called a microlith pattern with Lambda for our "infra meets code" document handling project (https://github.com/formkiq/formkiq-core).

There's nothing stopping someone from taking what we have and porting to an EC2, but for most use cases, this pattern seems to work best.

We break our Lambdas up by how they are used, to keep sizes down, with the option to break up further if we need to.