Full Stack Architecture and Feature Design Questions
Ability to design complete features considering frontend UX, backend API design, database schema, and data flow. Understanding of separation of concerns and communication between layers. API-first design thinking. Discussing trade-offs (e.g., complex queries on backend vs post-processing on frontend). Designing for extensibility and maintainability.
MediumSystem Design
0 practiced
Design backend delivery for push notifications to mobile devices across providers (APNs, FCM) supporting batching, retries, TTL, and per-device throttling. Describe the queuing/worker model, handling provider-specific errors, backoff strategies, and metrics to monitor delivery at scale.
MediumSystem Design
0 practiced
Design an offline-first mobile note-taking feature that lets users create, edit, and delete notes while offline and syncs when connectivity returns. Discuss client-side storage model, conflict resolution strategies (last-writer-wins, CRDTs, user merge), API endpoints for sync, and how to keep the server-side model scalable.
HardSystem Design
0 practiced
Design a billing decision API that must enforce strict correctness (no double-charges) while operating in a multi-region deployment with network partitions possible. Discuss where to place the canonical ledger (single region leader vs partitioned per customer), techniques to achieve serializability (leader-election, consensus groups), and how to balance latency and availability.
HardTechnical
0 practiced
Design an organizational strategy for safe API and event schema evolution across many teams. Include consumer-driven contract testing, a contract registry, automation in CI to validate backward compatibility, and governance processes to review breaking changes. Describe how tooling and process would reduce runtime failures after deployments.
MediumTechnical
0 practiced
A microservice's public API is slow because frontend clients issue many small, expensive queries. Propose a refactor plan that includes measuring hotspots, introducing aggregation endpoints or denormalized read APIs, adding caching layers, or introducing a GraphQL facade. Discuss rollout steps and how to avoid breaking existing clients.
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