314,552 interview questions from 6,000+ companies.
Tests ownership and structured problem-solving in debugging, including communication, prioritization, and learning under pressure.
Design a URL shortening service that routes, ranks, and monitors links at scale.
Design an ML-assisted rate-limiting service that scores request patterns in real time and applies adaptive limits across many microservices.
Explain how to write maintainable code using clear abstractions, small functions, tests, and documentation.
Tests fault tolerance strategies, failure modes analysis, and recovery mechanisms.
Tests practical performance debugging and optimization across the request path.
Tests concurrency, scalability, and latency-focused architecture decisions.
Tests end-to-end system design for streaming, state, and low-latency updates.
Tests system design skills for building a reliable, scalable notification pipeline.
Tests consistency models, distributed transactions alternatives, and correctness trade-offs.
Tests ability to choose caching approaches and reason about correctness and performance.
Tests database selection reasoning and ability to map trade-offs to product requirements.
Tests understanding of sharding, data distribution, and operational implications.
Tests observability fundamentals and system design for metrics, logs, and traces.
Tests ability to explain system architecture, components, and design rationale clearly.
