Revolut Senior Software Developer interview questions

Recruiter approached with a questions regarding database, data structures, java and concurrency. After answer it they scheduled a first interview with HR. More of the same. In the living code interview, interviewer gave some load balance tasks like register an unique load balancer and to implement a random algorithm to get a load balancer instance. While applying clean code practices and strict TDD from scratch - no engagement from the interviewer side at all. Although I was talking through my mental process all the time, little interactions were made. At the end, Interviewer only made one question in 45 minutes: how should you make a test if you want to be certain if the random algorithm was working? As I already implemented the test using a simple logic of getting at least one of several instances, he said that a way of doing it is trying thousands of times (exponentially speaking). It striked me as a surprise once tests should be deterministic and the given solution is not deterministic at all. Not taking into consideration the CPU and memory wasted. I mean, it's a random algorithm. After 1 day they vaguely replied that "after much consideration, we have decided not to proceed further with your application, as we require more specific knowledge to be successful in our recruitment process". That's it. I have no idea what this means. No feedback. No explanation after surviving 1 hour of me trying to read interviewer's reaction. The only "humane" part was the contact by the recruiter. All the rest was a set of trap questions that you must answer what they want to hear. This was my second and last attempt to enter in this company and after giving them some credit, process is flawed. They're looking at someone that would answer exactly what they wanna hear.