After I applied online, I was sent an email with a coding challenge. The challenge was as other people have described here. I was given a week to start it and 3 hours to complete it, but I think that they put a lot of emphasis in how long it takes to complete. I completed it in under an hour and my recruiter emailed me letting me know that he wanted to move forward with me. I set up a phone call with my recruiter, and it was basically a quick ~30 minute phone screening with basic questions and he allowed me to ask several questions about the position (no preparation needed for this call). A couple days later, I was asked to come for an on site interview for which they flew me to Boston. The interview process consisted with 2 1-hour long conversations with engineers. They each asked a technical question, but it was more like a conversation than an interview, which I really enjoyed. The hiring process was the fastest that I've ever had experience with. Responses were very timely and each phase of the interview had little delay in communication.

Starts with online assessment which needs to be completed within 90min. Call with recruiter. Coding round. System design round for backend coops. I was able to clear it and get an offer.