I was contacted after applying, as I had gone through the interview process before.

I completed one HR phone screen, one online coding interview, and five on-site interviews.

The on-site interviews included:

• 3 coding interviews
• 1 Linux knowledge interview
• 1 branching strategies interview

The difficulty of the interviews was based on a self-assessment I provided.

NDA, so I can't talk specifics, but in general:

• Coding questions around random numbers, string manipulation, grid search, and stream processing.
• Coding questions to re-implement two common Linux utilities.
• Long discussion about how to design and roll out a distributed build and test system.
• Discussion about branching strategy. For me, it was Git, as I know it best. Questions focused on choices made and their tradeoffs, handling unusual situations (i.e., bugs after release, security patches, hotfixes, etc.), and difficulties presented by the model as a whole.
• Other questions about bash and Linux fundamentals.