Meta Software Engineer interview questions

Five Interviews: Talked about a past project and deep dived into my thinking about it. Design a probabilistic english language word tokenizer. Design a data processing infrastructure for petabytes of data and estimate the cost & perf characteristics of the system. Permutate ways to count up to a number using a set of potential constituents. How to efficiently choose numbers from a set and prove that the solution is the big-O optimal solution.

Sent resume through campus career fair. They set up a phone interview within a week. I was called for on-site interviews at Menlo Park after a few days. Three interviews, lunch and campus tour, followed by two tech talks of sorts. The questions were fairly simple. Basic trees, recursion, order of complexity etc.