PM Technical Deep Dive: Architecture and Trade-offs of a Project You Shipped

You are interviewing for a product manager role at Stripe. The interviewer asks you to choose a project you worked on and take them through it in technical depth: what the system did, how it was built, which technical decisions mattered most, and what part you played in making them. ```hint Choose a project you can drill into Pick a project where you can go at least two levels below the architecture diagram and explain why each key technical choice was made, not only what was built. ``` ### Clarifying Questions - Should the project be one I led as a product manager, or can it come from an earlier engineering, analytics or consulting role? - How deep should the technical detail go: the overall architecture and data flow, or down to API contracts, data models and infrastructure choices? - How long should the walk-through run before you start probing specific parts of it? ### What a Strong Answer Covers - A project with real technical substance and a clearly stated personal role, chosen so it holds up under deep follow-up questions. - The system explained plainly: its components, how requests or data move through it, and the interfaces between the parts. - The key technical decisions and trade-offs, the options that were considered, and why the chosen path won. - How the candidate worked with engineering on risk, sequencing, rollout and production problems. - Measured results and an honest reflection on what the candidate would change. ### Follow-up Questions - What was the hardest technical trade-off on the project, and what would have happened if the team had chosen the other option? - Where did the system fail or degrade in production, and how did the team find out? - If the system had to handle ten times its load, what would break first and what would you change?