API Design: REST vs GraphQL vs gRPC
5 min read Every system you design needs an API. In system design interviews, choosing the right API style — and explaining why […] Read article
5 min read Every system you design needs an API. In system design interviews, choosing the right API style — and explaining why […] Read article
6 min read “Which database would you use?” is one of the most common follow-up questions in system design interviews. Many candidates default Read article
6 min read Designing a URL shortener is one of the most common system design interview questions, especially at the intern and new Read article
5 min read The bias-variance tradeoff is one of the first concepts asked in any machine learning interview. It underpins model selection, regularization, Read article
6 min read Gradient descent is the engine behind nearly every machine learning model trained today. If you are interviewing for an ML Read article
7 min read Caching is the single highest-leverage optimization in most system designs. Before you reach for database sharding or complex infrastructure, a Read article
6 min read Message queues decouple the components of a distributed system so that producers and consumers can operate independently. They appear in Read article
6 min read A load balancer sits in front of a pool of servers and distributes incoming requests across them. It is one Read article
5 min read The CAP theorem comes up in almost every senior-level system design interview. Interviewers ask it because it forces you to Read article
5 min read Database sharding is a core scaling technique you’ll need to explain in nearly any large-scale system design interview. The question Read article
5 min read Consistent hashing is one of the most commonly asked system design concepts at big tech companies. You will almost certainly Read article
11 min read DoorDash Interview Guide 2026: Last-Mile Logistics, Marketplace Engineering, and Delivery Infrastructure DoorDash is the #1 food delivery platform in the Read article
7 min read Robinhood Interview Guide 2026: Trading Infrastructure, Financial Systems, and Fintech Engineering Robinhood democratized retail investing and options trading. Their engineering Read article
18 min read Snap Interview Guide 2026: AR Engineering, Camera Systems, and Real-Time Communication at Scale Snap Inc. is a camera company — Read article
23 min read Shopify Interview Guide 2026: E-Commerce Infrastructure, Ruby/Rails Engineering, and Multi-Tenant Scale Shopify powers 10%+ of US e-commerce with 1.7M+ merchants. Read article