Slack interview questions

Contacted by recruiter. Finished assignment over the weekend. Phone interview with tech director who seemed to like the assignment result, questions were pretty straight forward. Recruiter emailed about on-site interview. Then recruiter called and said another tech lead wanted to phone screen. Didn't hear back for a few days. When I followed up again, I was told tech lead wanted someone more senior.

A recruiter reached out to me via email and we spoke over the phone. Several days later, I spoke with an engineering manager for about 30 minutes, also on the phone. Positive conversation, though they seem narrow minded about the technology they use and I found it difficult to gauge what exactly they are looking for the position. Immediately afterward, I received an email with the technical exercise and a deadline. No one asked me about my timetable before sending me the exercise, but I went ahead with it. The exercise was described as the entire technical criteria for the process. It was a straightforward web engineering task, and I was asked to use vanilla JavaScript throughout. I was thorough when completing the exercise and felt fine about what I sent in. About a week later, I received an impersonal rejection form email. There were no details or feedback, and there was no further communication from anyone at the company.