Kind of a waste of time. I don't hold it against them if they decide to pass but at least give some feedback. Applied through Stackoverflow. I had interviewed with this company a number of years ago and had a really great experience so I was excited to see a job posting from them. A few days later I received a hacker rank challenge from a non-technical recruiter which was 2.5 hours of questions. I acknowledged receiving it and shared my past experience that I was excited about the company and had previously interviewed 6-7 years ago and it was the best interview I ever had. I completed the challenge and know I got 3 of the 4 code questions working for the provided test cases which were pretty thorough. The other 3 questions were multiple choice and written questions. After completing the the non-technical the recruiter asked me for feedback which I spent a not-insignificant amount of time on and diligently provided. I again thanked them and expressed I was excited about the job. A few days later they informed me they were going to pass. I was a little disappointed but it happens. I thank them for their consideration and politely asked for feedback on why they decided to pass. I explained that it's hard to improve how well you do in interviews as rarely do you get feedback. Considering the thorough feedback I provided on the hackerrank challenge it seemed like a reasonable ask. After 5 business day I have yet to receive a reply and have zero incite into why they passed on me after dedicating hours of my time to their currently employed faceless interview process.