Bloomberg Senior Software Developer interview questions

A recruiter from a partner company contacted me via LinkedIn, we had a brief call about my background and resume. After exchanging a few email I was setup for a phone interview with a coding challenge on HackerRank. The interviewer was extremely on time and polite, he asked me about my background, resume, projects and a few behavioral questions like "Why Bloomberg?". After that we went ahead with the coding portion of the interview, I had some difficulty coming up with an efficient solution for the problem, but the interviewer walked me though it and we sort of came up with a solution. After that we had a brief Q&A section and that was it. Not surprises, next day I got a rejection email. I would describe the process until that point very pleasant, make sure you practice as much problems as you can and know your Data Structures. Which I have done better, but oh well, it was very good practice for future interviews.