First, there was a HackerRank test with time constraints. General C++ and algorithm problems were included. There were some challenging ones among them.

After I passed the test, there was a phone interview with HR. During the phone interview, HR insisted on finding out whether I knew how FlowTraders profit and what an ETP is, although it was stated in the job description that no prior financial knowledge was required.

Anyway, then there was a CodePair session with a person from the company. The person who interviewed me seemed very tired and impatient, and it appeared that s/he just wanted to get over with the interview. There was a very specific question about multithreading and an algorithm question related to string operations.

I did not know the answer to the first question, and I was upset and unable to come up with a good solution to the second problem. After two weeks, they told me that I was below standard.

What is the difference between boost::mutex and CriticalSection?

What lies beneath the mutex?