Most coding interview challenges I came along are of limited complexity. I think it is important to clarify that reading, discussing the spec, writing tests a p

Most coding interview challenges I came along are of limited complexity. I think it is important to clarify that reading, discussing the spec, writing tests a priori is something you would do in a real world coding task, but interviewers are usually more interested in the ability to discuss different approaches to solve them with their expected pros/cons, explain why some approaches won't work, prototype one out with some clean code and explain your thinking while writing the code. An experienced developer usually won't make a lot of mistakes for simple problems that require unit tests to see. If they do, the interviewer will make them aware and play the role of the testing, just to see how the candidate would react and solve the problem.