The initial interview was with a recruiter who asked some basic technical questions about OOP and functional programming. I was then sent a simple coding challenge that involved taking a text file stored on disk and returning statistics about the text, such as word count and the most common letter.

Finally, I had another technical interview with a Lead Developer. During this interview, I had to talk through my code and describe the methods I chose. We also discussed some of my previous projects mentioned in my CV.

What are the four principles of OOP?

What does it mean to be immutable in functional programming?