https://allarsblog.com/2018/03/16/confessions-of-an-unreal-engine-4-engineering-firefighter/

I have been working professionally with Unreal Engine for over 9 years. During this time, I have acquired many specializations and have fulfilled various roles in game development: from grunt engineering, to managing large engineering teams for games, or even consulting investors for game teams.

Lately I have been working for myself, but occasionally I will offer an emergency white-label “firefighting” service to my word-of-mouth clients. It is hard to describe what this service entails exactly, but it is a lot like having an emergency plumber. You really do not want to be in a situation that requires calling for one.