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.
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.
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
You are asked to implement client-side and server-side protections to avoid frontends sending extremely expensive queries to your backend (e.g., nested filters that cause heavy joins). Propose a combination of request validation, query cost estimation, and server-side safeguards, and explain how you'd communicate errors and rate limits back to the client.
MediumSystem Design
0 practiced
Design a feature-flagging system to gradually roll out a new UI experience to 10% of users, including service-side evaluation, client-side toggles, metrics collection for experiments, and quick rollback capability. Explain client caching of flags, offline behavior, and how to avoid stale flags causing inconsistent UX.
HardSystem Design
0 practiced
Design a secure, reliable webhook delivery platform for third-party integrations. Include signing and verification, retry/backoff policy, idempotency for receivers that retry requests, monitoring for slow or failed consumers, rate-limiting for abusive receivers, and how to safely version the webhook contract.
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