Was sent an OA that I was given 72 hours to complete. Spent around 13 hours on it. It was essentially asking to code an orderbook. I passed 29 of the 30 test cases within 3 hours and spent another 10 on the last test case. After rigurously profiling my code, I realised that the last test case (number 29's) bottleneck was reading from std::cin. Akuna just expected way too much input to be read from std::cin within the 2 second time interval. The test case essentially submitted a bunch of orders that never matched, so it was impossible for my order processing code to be the bottleneck to begin with. It's a shame that Akuna doesn't know that Hackerrank is leading to their candidates failing the 29th test case, mistakening candidates as not meeting their 'technical bar'. Don't waste your time here, read the reviews on Glassdoor and move on to another firm if you're interested in Finance.

They ask difficult questions but, given the role they seemed fair. They are painfully slow about the process and I wasn't able to attend the final round interview due to a job deadline I had informed them about, which I had to commit to since they did not reach back soon enough. Later they informed me they'd like to continue but it was too late lol.