Meta Performance and Capacity Engineer interview questions

I applied online, and within a few weeks a recruiter followed up with me to do an initial screen. After the screening, I had a phone interview with a team lead for the performance and capacity engineering group. After that phone call, they decided to fly me out to Menlo Park for a full day of interviews. I met with 6 people at Facebook's main campus. Each interview was about 45 minutes and had a different focus: - Coding interview, where the goal is to come up with a solution as fast as possible (on a whiteboard). - System design. - Probability and statistics. - Culture fit. Everyone I met was very pleasant and friendly, and the recruiters were quite helpful throughout the process, almost acting as a sort of coach. Less than a week after the on-site interview, the recruiter contacted me to tell me they would be moving forward with other candidates. When I asked for feedback, I was told I didn't perform well enough on the coding exercise (though I did solve both problems, but perhaps I wasn't fast enough?).

There was an initial phone call with the hiring manager to assess job fit, followed by a phone screen interview, and an all-day interview gauntlet on-site in Menlo Park. Despite things seeming like a good fit for my software and DBMS optimization skills during the phone discussions, it turned out that the group was interested in low-level hardware design issues (e.g., optimal cache-line sizing).