The spec was detailed enough that you couldn't really complain about ambiguity, which is kind of a double-edged thing.
Start by clarifying requirements and constraints, then outline a high-level architecture that separates concerns: data fetching, caching, UI rendering, and testing. Walk through the design decisions for infinite scrolling, offline support, and test coverage, explaining trade-offs and how you would validate the solution.
Pro tip: Emphasize how you would simulate offline scenarios and edge cases in tests, and discuss how you would measure performance metrics like time-to-interactive and scroll jank to ensure a smooth user experience.
Ask questions to understand the API capabilities, expected data volume, offline expectations, and performance targets. Confirm the scope of test coverage and any platform-specific constraints.
Outline how to fetch, cache, and synchronize data. Discuss using a service worker for offline support, IndexedDB for persistent storage, and strategies for pagination and prefetching.
Explain how to implement infinite scrolling efficiently, using intersection observers or virtualization to avoid performance issues. Describe how to handle loading states, errors, and offline indicators.
Describe the testing strategy: unit tests for components and utilities, integration tests for data flow, and end-to-end tests for critical user journeys. Include how to mock network conditions and test offline behavior.
Highlight key trade-offs such as cache invalidation strategies, memory usage vs. performance, and complexity of offline sync. Explain how the design scales with growing data and user base.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.