The most unprofessional and frustrating interview I had in 20 years.

• You are presented with crappy code you are supposed "to refactor," but you are not allowed to change the internals, like the type of data structure used.
• Compilation is broken, and Intellisense does not work online.
• Untrained interviewer: not interested, unable to articulate requirements. For example, refactoring usually assumes preserving the interface but changing the implementation. They have a different view.
• Requirements are popping up surprisingly: "We have many/not many items in the buffer, that is why we should stick with an array."
• Communication: Chinglish and cultural problems. You feel like you are #100+th in a queue.

During the last 4 weeks, this position was advertised in a few countries. Based on their interview process (screening + 5 stages) and attitude, I believe they don't really hire – they just need to feed the interview pipeline. Do your research and save time.

Refactor n-way associative cache implementation.