Revolut Developer interview questions

I think my interviewer for the live coding interview could have been better prepared. I implemented everything he asked for, but was rejected because I did not use mocks in the tests, and did not implement additional validations to my code, even though I constantly asked him if he had any other improvements in mind that I needed to implement. He expected me to guess what I needed to do instead of actually telling me? I was very communicative and open regarding my code, and somehow he did not asked me to create tests using mocks, so I assumed my tests that had 100% coverage were ok for the interview. Also, I was presented a problem I never encountered in my life (designing a load balancer) and since a lot of simplifications were made to the problem itself, I assumed that the validations I implemented were also ok. I asked lots of times if I was missing some validation, and was simply told "no, thats ok". Than the reasoning behind the rejection had this: "being open to adding validation logic when prompted would have improved robustness and demonstrated stronger ownership of edge cases and input safety."

Conversa com RH, depois tecnica com tech lead. Perguntas sobre a stack que usam e eventualmente perguntas de conhecimento geral da programacao(programacao orientada de objetos, por exemplo) e codigo na pratica.