service layer
An application service coordinates a use case across entry points.
Use this when HTTP endpoints and background jobs duplicate the same business workflow.
without the term
“Creating an order is implemented once in the API route and again, slightly differently, in the import script. Can you put the logic in one place both use?”
with the term · How do you ask a model for service layer?
Move this shared use case into an application service. Verify the HTTP endpoint and import job use it and preserve their existing behavior.
What is service layer?
A service function implements one use case, such as creating an order, and every entry point calls it: HTTP routes, jobs, and scripts. Parsing and presentation stay in the entry points.
Why does service layer matter when vibe coding?
A fix applied to one entry point may leave another implementation inconsistent.
How do you do service layer?
Extract the shared operation and keep its dependencies explicit.
What goes wrong with service layer?
Introducing unrelated persistence abstractions merely because a service was extracted.