Valve is hiring Linux developers :

Quoting:The company has been doing this since 2011. The Steam on Linux team currently has 11 members, and they're looking to hire more developers. Sound like your kind of job? Drop the company a note at: valvelinuxteam@valvesoftware.com.

Quoting:Valve continues to be interviewing other Linux developers I have referred to the company. If you're a very well qualified Linux developer and wouldn't mind living in the Seattle area while working for one of the best game companies, contact me. If your work is very well known, your Linux accomplishments have been covered in the past eight years on Phoronix, or has similar experience that could benefit Valve, I'd be happy to get you in contact with their growing Linux team. They just aren't looking for OpenGL and game developers but anyone with Linux experience across the board.