Slack Staff Software Engineer interview questions

1) Screening interview with recruiter 2) Screening interview with a manager 3) Coding challenge (actually, review a PR in Github) 4) Call with recruiter to give me "tips" 5) 4.5 hour process, with 1 manager, 1 coding session (1.5 hours), 1 system design session (~45 min) and a soft skills session with a Senior Staff Eng. Recruiter told me they have a 24 hour SLA to give results, I got mine 10 days after, stating that "my technical skills were fine, but there wasn't a cultural fit due to me not being collaborative". So I guess me talking about how I collaborate with every team in every company I've been in, and trying to have "collaborative" technical sessions with interviewers that barely spoke a word was not enough for them.

I applied online, and the recruiter reached out to me. He was very interested and mentioned that I would be an excellent candidate for this position. He scheduled a phone conversation with the hiring manager later on. During the interview, the hiring manager showed a lot of interest and even gave his email for any questions for the further steps in the interview. After that, they did not get back to me. I do not expect to be accepted, but it would be minimum respect for a candidate to give a response. You do not even respect the time of the candidate.