You can solve alot of these with multi-module projects, at least in Kotlin/Java. You have a single codebase, with modules for each route, and modules for share

You can solve alot of these with multi-module projects, at least in Kotlin/Java. You have a single codebase, with modules for each route, and modules for shared infra/domain code. Maven builds a JAR for each Route with only the resources that route needs, you deploy a single lambda for each JAR - but - you deploy them all together as part of the same build pipeline. Then you have, non-monolithic lambdas, that can easily be performance tuned and privileged individually, but a single codebase that represents a whole 'microservice' application in one place, with shared code, that can be upgraded and kept consistant.