I got my initial phone interview through an employee referral.

This was followed up with a second phone interview, as I don't think I did too well on my first one.

I did manage to get to an onsite interview in San Bruno with four interviewers.

However, I ultimately failed to get hired.

None of the questions were really difficult in a logical sense after preparation from the provided materials. However, I think I misinterpreted the question the second interviewer gave me after later reflection.