Your question is Spec and Implement Full-Stack Feature. 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).
How would you spec out and implement a full-stack feature?
Explain how you would clarify requirements, define the frontend and backend contract, break the work into deliverables, manage dependencies, test the implementation, and plan a safe release. Describe the trade-offs you would evaluate and how you would keep stakeholders aligned throughout execution.