It was my 4th attempt.
All were for C++ language, I failed at the first coding round.

I've interviewed Microsoft, Amazon, Facebook, Google for multiple roles and multitple times,
but Bloomberg question was the toughest.
The problem itself was not that difficult compared to those,
but they seem to expect the perfect and flawless touch till the end.

Last year, I tried 3 times for senior engineer role.

One was finding island from 2d matrix, the other was to create max-stack class.
Last year I was not that much prepared. But I thought I showed them well about my good approach.
But failed pass the round I think it was because I didn't finish writing the test cases and making generic 'template class' for the max-stack case.

The last one last year was totally disaster. I had to write algorithm for leader-borad like data structure. I finally managed to create one, but I had to try several different data structures and it became spagetti code. And when I explain the complexity, I explained wrong, I meant each call it O(Log N), so total call will be N Log N, I didn't efficiently explain this, so the interviewer though I was thinking my function is N Log N. Which may seem to the interviewer I don't even understand the complexity.

I thought I am nowhere near to Bloomberg, and stopped looking at the positions from Bloomberg.

And the I was laid off, I found new position from Bloomberg. I wanted to try the last time.

This time, I had interview with the hiring manager at first. It was good. And then this coding round.
I thought it was also fine. The question was simple, I thought I explained quite well, unit test was successful.,
But there was slight mistake. I didn't return the function when I found the solution, so the function went through the whole items in the list.
The interviewer pointed out, and I didn't catch what he was saying because I thought it was not that important factor that I can just return right there. I changed that line and said 'yeah, nice catch. I just can replace this line'. I think that was my only mistake.

And then, I received the failure mail from Bloomberg.

So yeah, Bloomberg has very strict and high standard when it comes to the interview.

It was nice to had such a valuable chance.

Good luck, Bloomberg. Fairwell.,