Sporty Group Senior Java Backend Engineer interview questions

Hackerank's medium difficulty problems (90 minutes) to solve before the screening call. Then the usual chat with HR recruiter. Later got invited to the 2 hours and 15 minutes interview with 3 developers. The interviewers were pleasant and made a lot of technical questions, from system design to Java/Spring, database query optimisation, choosing technologies and so on. Two out of three interviewers explicitly told me that they were satisfied, and the other one looked satisfied to me, but I got an email saying that I failed the interview with no feedback. Shame on me investing 4 hours interviewing