A popular games engine that is no longer supported, and succeeded by Unreal Engine 4.
I've used Unreal Engine 3 on 3 projects.
I've used Unreal Engine 3 in 2 jobs.
Towards the end of my time working on Gears of War 4, I began work on studio-wide tooling and backend services that addressed a variety of needs.
My responsibilities were more or less a continuation from my previous position as an Assistant Tools Programmer.