Approach: Define requirements for consistency and privacy, then design layered architecture with local persistence, sync queue, and server-side reconciliation.

Considerations: Prioritize offline-first design and privacy. Avoid unnecessary server data, minimize network calls, ensure on-device encryption for data sovereignty.

Key Points: Implement vector-clock conflict resolution, reference CloudKit, handle network transitions gracefully, show awareness of battery and bandwidth constraints.

Approach: Use systematic profiling with metrics gathering, reproduce with Xcode instruments, identify culprits via stack traces, validate fixes with benchmarks.

Considerations: Prioritize user-perceived performance and responsiveness over raw throughput. Consider thermal impact and battery drain in mobile contexts.

Key Points: Reference Core Animation profiler or Metal GPU debugging tools, discuss shipping improvements at scale, explain regression monitoring strategies.

Approach: Define clear contracts with input validation and error handling, use type safety and compile-time checks, provide sensible defaults, disclose complexity progressively.

Considerations: Value clean, intuitive APIs that feel natural. Avoid surprising behavior, minimize parameter overload, prefer explicit over implicit patterns.

Key Points: Show familiarity with Combine, SwiftUI, URLSession. Discuss documentation of pitfalls, examples, compiler warnings for misuse patterns.