Browse focused guides for system design, Java and backend engineering, and data-structure and algorithm practice. Behavioral mock interview practice is available in the product.
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Comprehensive system design interview guide for TinyURL / URL shortener. Learn capacity estimation, Base62 vs hashing, Key Generation Service (KGS), caching, and SPOF analysis.
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Master modern Java concurrency and multithreading interview questions. Explanations of JVM memory model, Virtual Threads, ThreadPoolExecutor, ReentrantLock, and thread-safety traps.
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Comprehensive system design interview guide for an API Rate Limiter. Compare Token Bucket, Leaky Bucket, and Sliding Window with distributed Redis Lua scripts, memory sizing, and fail-open resilience.
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Master top Spring Boot and microservices interview questions for 3-6 years experience. In-depth answers on Spring Boot 3, @Transactional pitfalls, distributed tracing, and Saga pattern.
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Step-by-step guide to implementing an LRU cache with expected average O(1) get and put operations under typical hash-map assumptions. Includes doubly linked list and hash map implementations in Java, Python, and C++.
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Explore a notification-service design for push, SMS, and email, including priority queues, idempotency, rate limiting, and provider integrations.