[jitix]

Having worked at smaller companies (~ 500 people) in different stages (series-A, unicorn and post IPO) I very much like the idea of a lean platform team that defines the interfaces that are used to control interaction between different modules, and with external services.

Yes it creates friction and reduces velocity at ticket level but it prevents misalignment errors in UAT and production. This can be solved somewhat by having dedicated product owners in each module but it's often not feasible for smaller companies and brings in too much non-technical chatter.

For example, if your product acts as a metadata repository as well as a task execution engine it is important that the execution engine modules access the metadata only using streamlined (and maintained) internal APIs and not hit the database or maintain duplicate metadata for different engines. This way you actually improve velocity at milestone/release level because you're free to make changes to the metadata codebase without breaking features in various downstream execution engines.

In my experience, with a well-scoped platform team, the integration phase of a release gets significantly smoother with fewer defects. YMMV based on product type and company size.