Your question is Most Technically Challenging Project. 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 the most technically challenging thing you worked on. Explain the technical difficulty, your specific responsibility, the decisions and trade-offs you made, and the outcome. Focus on how you handled ambiguity, collaborated with others, and took ownership rather than simply describing the technology. Use a specific example and structure your response around the situation, task, actions, and measurable result.