Slack IOS Engineer interview questions

The process consisted of a phone interview with recruiter (30 min), coding challenge (~5-6 hrs over 2 days), and the on-site (4 hrs). The phone interview & on-site were basically not technical at all, which was weird considering I was applying for a technical role and the people I met w/ tried to advertise Slack as a great engineering company. I didn't get the impression that it'd be a good place to work as an engineer or engineering manager. The eng team is still small but felt pretty disconnected already. The director and engineering manager I met with seemed overly obsessed with advertising how great Slack's culture and work environment is, even though I didn't get the impression they actually enjoyed working at Slack themselves. My interviewers also seemed apathetic about doing interviews. The coding challenge is pretty standard. I spent several hours on it but was never given any feedback. Even though it led to my getting an offer (probably), I was frustrated that I was never asked about my solution or how I approached my solution at all. The whole interview process felt a bit dishonest and out of place, tbh. I have another offer that I'm going to take.

Do not waste your time doing the take home exercise for this company unless they pay you! Got contacted by the recruiter, was told about the interview process and was given the take home exercise. Finished the exercise over the weekend was then contacted by the recruiter saying the that the exercise looked good and scheduled a call with the Hiring Manager. Had the 1 hour call with the hiring manager and was immediately asked to go for the on-site interview. Was interviewed by three pairs of engineer/managers/qa. I was NOT asked a single technical question! All the questions were about the QA process. The last interviewer(s) did not show up due to family emergency and I did not even get a chance to speak with the hiring manager directly. Two days after the interview I was contacted by the recruiter and was told that the team found me weak on the OOP concepts!!!