Behavioral & Leadership: End-to-End Project Walkthrough

You are in an onsite software engineering interview. The interviewer asks you to walk through a recent project you led end-to-end. Address the following points clearly and concretely:

1. Problem and context
2. Your responsibilities and ownership scope
3. Key technical decisions and why you made them
4. Measurable impact (with numbers)
5. Toughest challenge and how you resolved it
6. Collaboration with managers and stakeholders
7. Trade-offs made under constraints (time, risk, cost, scope)
8. What you would do differently in hindsight