There are no “puzzles”, but problems to solve. I expect that things like this string search are entry level / new grad kind of question. Someone more senior wit

There are no “puzzles”, but problems to solve. I expect that things like this string search are entry level / new grad kind of question. Someone more senior with more experience should have different kind of problems to solve. I certainly didn’t have a bad experience when interviewing at Google and Facebook. One question were not very concrete, but it was interesting to walk through and solve. I didn’t just “know” the answer, I had to explore a few directions before getting the right one, but I’m sure that explaining my thought process, interacting with the interviewer, validating and debugging my algorithm in a principled way and fixing my bugs were all the elements they are looking to see.