All 30 days
Day 30 / 30 · 2025 Edition
System Design & Integration
Integrating with backend systems: REST, GraphQL and SDKs, integration patterns, event-driven communication, circuit breakers, sagas and API gateways.
Inside this day
Questions and detailed answers at four levels — Junior, Mid, Senior and Architect — with code samples and architect's insights.
Try answering each question out loud before you read the answer — that's the closest thing to a real interview.