Applied online, got a reply in about a week. A phone screen was scheduled. The phone screen was mostly about my experience and was more of a conversation.
The onsite was really an amazing experience. Coming into the Tinder office, the recruiters greet you and make you feel extremely welcome. The entire atmosphere for the office is really "chill". Employees all work together in one office space and everyone seems to be really passionate and happy at first glance. I loved it!
The interviews themselves were really different from you standard fare. Every one of the interviewers that I met was very enthusiastic and well...happy. This made me feel extremely comfortable. I don't think that there was a moment during this entire process where I was nervous, and after the interviews I didn't feel mentally exhausted. The questions were fairly customized to my resume - I wasn't solving a bunch of random algorithmic puzzles. They wanted to get to know me as a candidate and see if I was a good fit. I solved two or three simple programming questions and several design questions.
After the interviews, a recruiter actually talked with me and actually took the time to explain how Stock options work (this is potentially going to be my first job and I wasn't sure about these). He was also very honest about what working at Tinder was like and sharing his own personal experiences. I really did appreciate that.
Overall, I think Tinder is a great company with some amazing people working there. I have interviewed the big 4 - Microsoft, Apple, Google and Amazon and some mid-sized companies and another startup, and honestly I will say this, the process at Tinder is the best experience I have had. They respect you as a candidate and go above and beyond to make you feel comfortable.