DeepMind (2010-)

They seem to do some cool stuff.

They have also declined every one of Ciro Santilli's applications for software engineer jobs before any interview. Ciro always wondered what does it take to get an interview with them. Lilely a PhD? Oh well.

In the early days at least lots of gamedev experience was enough though: www.linkedin.com/in/charles-beattie-0695373/.