Revolut Sr Software Engineer interview questions

I advise people not to waste their time. I wish I read others reviews before bothering. 5 stages of interview, initial screen with internal recruiter was fine. Coding challenge was a nice challenge. I would say I did it almost all right with TDD and explaining my thoughts and fulfilled all their requirements. Was just core java which I have 15+ years experience. I've interviewed many people and know exactly what is being looked for. The interviewer seemed unengaged for some reason. I just got an email back to say they thought about it and decided no. And said for me to learn their tech stack and come back. I was only tested on java. I also have architected and written full products including pipelines and all the cloud infrastructure as code so have plenty of experience in many tech stacks. As for the role, they seem to just write java and are quite old school where the engineers don't touch any of the devops side. They have a very basic career path but I would like to thing that would change as they mature as a company. The main problem with the interview though is I asked for feedback from the recruiter I dealt with and the initial recruiter that reached out to me. Both of which didn't have a level of professionalism to respond. Maybe worth in a few years when they matured a little as a company