Your question is Lead Through Failures and Regressions. 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).
Describe a challenging technical project you led and how you handled unexpected failures or performance regressions. Please choose a specific project and explain the technical stakes, your responsibilities, how you diagnosed and prioritized the failures, and how you coordinated the response. Include measurable results where possible, what you learned, and what you would change in retrospect.