Overall an awful experience. The first few one on ones interviews were good. We talked about API design and security, testing and TDD. However the last interviewer was terrible. The last interviewer (I believe a principal engineer / architect) was clearly not interested in talking to me. He spent more of his time checking his email than listening to my answers to his questions. The questions he did ask were very vague, but he had very specific answers in mind. One such was "I have a slow query, how do I make it faster?" Apparently the answer was shard the database. After a minute of talking through things I would do he got frustrated and said "The answer I was looking for was sharding." and then moved on. I was then asked to write some code on paper for finding repeated substrings which I did quickly in a few lines of code. I was then asked to do a code review on my few lines of code, which I did while he read his email and didn't seem to pay attention to a word I was saying. He then went on about how Lookout is doing some groundbreaking work, and then said "you can't look up the problems we have here on stack overflow and paste the code in." In a way that very clearly implied that's how he thought I wrote code. I was sent a rejection email within 5 minutes of walking out of the building with no feedback. Avoid interviewing with this company at least in Boston, they're not worth your time.