I was called by someone from HQ – from London, I guess.

Then I had a full day interview, an online test, then we had a lunch break, and then the main interview.

The online test was a multiple-choice test, including math, C/C++, data structures and algorithms, and logic questions.

The main interview covered:

• Sorting & searching algorithms: mostly binary search and merge sort with time complexity, etc.
• OOP concepts: overloading and overriding, operator overloading + good code practices.
• Array vs. list.
• What is a hash, set, stack, etc.
• Memory management: heap vs. stack.
• Dynamic memory allocation for an array and matrix (don't forget to check whether it is null or not).