You should have at least one senior, someone with knowledge of architecture to help. Seems like they throw bodies at the problem instead of having proper engine

You should have at least one senior, someone with knowledge of architecture to help. Seems like they throw bodies at the problem instead of having proper engineering. You probably lack a big picture, try to create architecture diagram this will help you orient. You don’t need details of FastAPI. You have docker but how is communication between services done? How its deployed? How you debug? Do you have distributed tracing? What DBs? Learn the data schema and also problem domain.