System Design Interview: Email System at Gmail Scale
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
System Design
System Design
System Design Interview: E-Commerce Product Search (Amazon Scale)
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
Algorithms
Docker and Kubernetes Interview Questions (2025)
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
Algorithms
Concurrency and Multi-Threading Interview Questions (2025)
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
System Design
System Design Interview: Social Network at Scale (LinkedIn / Facebook)
8 min read Social networks combine graph data structures, feed generation, search, and recommendation systems — all at massive scale. This question appears Read article
System Design
System Design Interview: Ride-Sharing App (Uber / Lyft)
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
AI/ML Interview Questions
How Does Backpropagation Work? A Complete Interview Guide
8 min read Backpropagation is the algorithm that makes neural network training possible. Understanding it at the level that interviews require — not Read article
Algorithms
TypeScript Interview Questions: Types, Generics, and Advanced Patterns (2025)
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
System Design
System Design Interview: Rate Limiter
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
Algorithms
SQL Interview Questions: Joins, Window Functions, and Query Optimization (2025)
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
AI/ML Interview Questions
Machine Learning System Design Interview: Feed Ranking, Recommendations, and Search
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
System Design
System Design Interview: URL Shortener (TinyURL / Bitly)
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
System Design
System Design Interview: Notification System (Push, Email, SMS)
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
Algorithms
C++ Interview Questions: Memory, Concurrency, and Modern C++ (2025)
10 min read C++ interviews go deeper than most language interviews — interviewers expect you to understand memory management, the object lifecycle, undefined Read article
System Design
System Design Interview: Distributed Cache (Redis vs Memcached)
9 min read Caching is the first answer to scaling — but designing a correct, consistent caching layer requires careful thought about invalidation, Read article