Your question is Overcoming a System Design Bottleneck. 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 ran into a major technical challenge while designing a system, especially when the requirements were still evolving. How did you diagnose the bottleneck, align the right people, and drive the design to a workable outcome?