Applied for a Senior Software Engineer role and they sent me immediately into a take-home coding exercise where we were to implement a HTTP service to store and access data. I completed it pretty easily along with some additional unit tests and a nice write up. I got a rejection email a week later with no feedback whatsoever and I'm eligible to "try again" in 6 months. Whatever that means. Without any feedback, how are us as applicants supposed to improve at all?

First stage recruiter call (45 minutes) which went well, both sides confirmed we'd like to progress to the next stage and the process was outlined. I was subsequently ghosted for 8 weeks, only getting a response when I emailed saying I'd withdrawn my application - to tell me that the team was being "rethought" and the job may not actually be available anymore but they'll let me know (they never did).