Tinder Backend Software Engineer interview questions

Applied online and got an email from a recruiter. We had a quick chat about Tinder and its different teams. All the recruiter were super cool. I received a take-home coding challenge which was developing an online multiplayer tic-tac-toe game in Node.js (Use socket.io). I had a lot of fun doing the project actually. Then there was an online phone interview with two coding exercises. Finally the onsite round. The office is pretty cool. The people that work there are sooooo LA. They have free catering food for lunch and dinner everyday. They make you bring you own laptop. First, they give you two hours to develop a REST API in Node.js that uses a database system. The project is pretty much open and it could be whatever you want. You then explain it to two engineers. After that they ask you a bunch of questions about the project you just coded and how you would scale it. Lots of database questions. So far so good. After that you have a 1-on-1 with what I think it was the head of the whole development team. He was kinda dou-chey and condescending when asking questions. He was playing with a Rubik's cube the whole interview. You could also see on his face how he thinks he is so good at analyzing you while you answer. Like you could tell how he thinks so high of himself and how he thinks he can read you perfectly. But whenever you made eye contact with him he would go from the dummy-analyzing-face to a fake smile. He asked about databases and the meaning of different acronyms and he makes you guess when you tell him that you don't know what that acronym stands for so he could arrogantly say "No, but good guess". In the end he tried to casually end the interview saying "I only have one more question for you" but you could tell he was actually trying to make you think that the next question was not going to be a big deal. The question was "Why do you want to work at Tinder?" After asking that question you could see how he went from being distracted to paying attention closely to what you were about to say like if he just pulled off a great acting performance. He does know a lot and he is probably super good at what he does. Finally another 1-on-1 with the head of the backend engineering team. Super cool guy. He just asks you about your previous projects and jobs. Overall a very positive experience. I learned and had so much fun in the process.

Initial phone interview going over basic analysis of how to design a website for selling tickets, how to scale, how to deal with atomic operations, etc. Onsite technical interviews (4 of them) with each asking different flavor of questions, one with whiteboard coding, others with coding on a computer. Familiarity with JavaScript syntax wasn't too great, so used python actually - no problems. Came back one more time for a quick interview with the CTO.