8 min read Food delivery is a three-sided marketplace connecting customers, restaurants, and delivery drivers — more complex than ride-sharing because orders involve […] Read article
8 min read Ticketing systems for concerts and sports events are famous for their demand spikes: a Taylor Swift concert sells 50,000 tickets […] 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
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 ML system design interviews are distinct from algorithm interviews and from traditional system design interviews. You are expected to define […] Read article
10 min read C++ interviews go deeper than most language interviews — interviewers expect you to understand memory management, the object lifecycle, undefined […] 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
7 min read Sliding window and two pointers are among the most powerful patterns for array and string problems. Recognizing when to apply […] Read article