Initial phone interview with the hiring manager and then a coding assignment. They said the coding assignment would not take more than 2-3 hours. When I worked on it , it took me around 12-15 hours. After submission, got a general rejection email. I asked the recruiter for a feedback. They gave the feedback and what I realized is that the way they evaluate the project is similar to production code. All the corner case, perfect code, read me files, unit tests, most efficient way to write queries etc. They need to understand that the candidate is working a full time job and to spend 15 hours of his time on the test itself is a lot of effort. Rejecting a candidate since the assignment needs to be of production quality, sounds little harsh. Advice to candidates. If possible avoid coding assignment. Time sucker and not worth the effort.

The interview process consists of a coding challenge, phone screen with the hiring manager and then an onsite interview. I was given the option to skip the coding challenge and directly talk with the manager as I am a seasoned engineer. However, I chose to do the coding challenge so that I can have a good conversation during the onsite interview, if I were to be called. It took quite a bit of time to complete the coding challenge (> 20 hours) and given that I have a grueling full-time job, it felt like I was doing two jobs. Anyways, after the coding submission, within a few days, I was notified that I was selected for the next round and I had to talk with the hiring manager. The interview with the hiring manager lasted for 45 minutes and I felt like we had a very good conversation where we discussed my experience at length. Fast forward to a few days, I got a generic rejection letter stating that I didn't fit the bill. I honestly feel for the amount of effort I had to put in, I would have expected a bit more feedback beyond the generic "You are good, but not good enough" email. If you are interviewing for Slack, if possible, please avoid doing the coding interview. Or, talk with the hiring manager and explore a fit before you take up the coding challenge, that way, you at least know that working on the coding assignment is worth your time. Slack, If you are listening to the feedback over here, please understand that interviewing is a two-way street. If you expect people interviewing for your company to spend > 20 hours, we would expect a little bit of effort from your end as well.