⏱ 7 min read Notification systems are invisible infrastructure that every major app depends on. A good design handles multiple channels (push, email, SMS), Read article

⏱ 7 min read The URL shortener is one of the most common system design interview questions because it touches every major challenge: unique Read article

⏱ 9 min read Behavioral interviews determine whether you will be hired as much as technical interviews at most companies. Google calls them “Googleyness,” Read article

⏱ 9 min read Caching is the first answer to scaling — but designing a correct, consistent caching layer requires careful thought about invalidation, Read article

⏱ 6 min read Apache Kafka underpins event streaming at LinkedIn, Uber, Netflix, Airbnb, and thousands of other companies. Understanding Kafka architecture deeply — Read article

⏱ 6 min read Java remains the dominant language at Amazon, Google, Goldman Sachs, and most enterprise tech companies. This guide covers the Java Read article

⏱ 12 min read Rust is growing rapidly in systems programming, WebAssembly, and high-performance services. Companies like Cloudflare, Discord, AWS, and Dropbox use Rust Read article

⏱ 4 min read System design interviews terrify most engineers because there is no single correct answer — and interviewers rarely give much direction. Read article

⏱ 6 min read Designing a real-time multiplayer game backend is a fascinating system design problem that combines the constraints of ultra-low latency, authoritative Read article

⏱ 8 min read Security knowledge is increasingly expected in senior engineering interviews — not just for security engineers. This guide covers the API Read article

⏱ 9 min read Designing a distributed task scheduler — like AWS Step Functions, Airflow, Celery, or cron at scale — tests your ability Read article

⏱ 9 min read Designing a web search engine is one of the most complex system design problems — it combines large-scale crawling, indexing Read article