Meta Production Engineer interview questions

Online application -> Behavioral phone call with around 10 short technical questions -> Coding interview -> Systems Interview. The coding interview was relatively easy, however the systems interview was quite hard, needing some serious knowledge of the linux kernel. The process was very smooth, feedback was prompt, interviewers were friendly and helpful, all around good experience.

Their HR dept contacted me. First step was doing a phone interview with their HR dept, nothing intense. Second step was to do a code test. Spent 45 min while Facebook look at what you're writing. Did a coding challenge but there no way for you to test/complie your code. They assumed you know the correct syntax, etc.