9 min read Object-oriented design (OOD) questions test whether you can translate real-world requirements into clean class hierarchies. Amazon, Uber, and Microsoft frequently […] Read article
8 min read Designing a live streaming platform is fundamentally different from designing video-on-demand (YouTube). The challenge is latency — live content must Read article
7 min read Kotlin is the primary language for Android development and is increasingly used for backend services (Ktor, Spring Boot). Kotlin interviews Read article
5 min read Design pattern questions test whether you can recognize common structural and behavioral problems and apply established solutions. Interviewers at Google, Read article
7 min read Designing an email system is a favorite at Google (who built Gmail) and at companies that rely heavily on transactional Read article
7 min read Product search at Amazon or eBay is one of the most complex search systems in the world. It must combine Read article
9 min read Docker and Kubernetes questions appear in backend, DevOps, platform engineering, and SRE interviews. Interviewers expect you to understand containers at Read article
8 min read Concurrency questions appear at almost every senior engineering interview. Interviewers test whether you can reason about race conditions, design thread-safe Read article
8 min read Social networks combine graph data structures, feed generation, search, and recommendation systems — all at massive scale. This question appears Read article
8 min read Designing a ride-sharing app is a top-5 system design interview question, especially at Uber, Lyft, DoorDash, and Meta. It combines Read article
8 min read Backpropagation is the algorithm that makes neural network training possible. Understanding it at the level that interviews require — not Read article
9 min read TypeScript has become the default choice for large-scale JavaScript projects. Interviews for frontend, full-stack, and Node.js roles routinely include TypeScript Read article
8 min read Rate limiters protect APIs from overload, prevent abuse, and enforce fair usage. Almost every system design interview that involves an Read article
8 min read SQL is tested in almost every data engineering, analytics engineering, backend, and data science interview. Questions range from writing a Read article
8 min read ML system design interviews are distinct from algorithm interviews and from traditional system design interviews. You are expected to define Read article
