Bloomberg Senior Software Developer interview questions

Got engaged to do a 4 hours interview. First hour a code test, second hour another code test, and the rest 2 hours system design and dialogue. I did solve the tests, but I didn't receive an offer. HR said that was able to schedule a call to understand what I could improve but I never got contacted back.

Got referral from friend, then first phone screen with the HR. After the phone screen, got to talk to the hiring manager to see if it is a fit for the team. After that, two rounds of technical interviews are scheduled for the same day. Both are leetcode oriented interviews. One is more algorithm like( If I remember it correctly, it must have been a stack related question), the other is a data structure problem. Questions are not hard, got to solve them pretty easily. However, because they need someone who can work readily, did not get an offer.