After a quick phone call with the recruiter, they presented me with a coding exercise. It is a project that you have to finish in one week.

My project was a binary memcache protocol implementation (get and set commands only). The protocol is supported by famous memcached.

I submitted my implementation on time, and after another week, I got a call from the recruiter who informed me that my implementation doesn't meet some never-specified criteria. I have never been contacted by a Slack engineer.

After spending a week, I would expect some technical feedback, discussion, comments, or questions. I find that kind of response somewhat unprofessional and disrespectful.

If you'd rather not waste a week, or the exercise isn't something that is very interesting for you, I would not bother with Slack.

My project was a binary memcache protocol implementation, focusing on the GET and SET/CAS commands only. The protocol is supported by the famous memcached.