Your question is Learning a New Stack Fast. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you had to make meaningful progress in an unfamiliar codebase or a language you hadn't used before under real time pressure. How did you get up to speed, decide what to ignore, and still deliver a reliable result?