Interview-first approach: Every concept is taught with whiteboard explanations and follow-up questions in mind, not implementation details you'll never need
Real architecture case studies: See how Twitter, Netflix, Stripe, and Google Docs actually use REST, GraphQL, and gRPC together in production
Decision frameworks, not rules: Walk away with systematic approaches you can apply to any new scenario, not memorized answers that break under pressure
By the End of This Class, You'll Be Able To:
Confidently introduce REST, GraphQL, and gRPC in 30 seconds -with the exact phrasing that signals senior-level understanding
Apply the Four Pillars framework to evaluate protocol choices for any system design scenario
Articulate tradeoffs across performance, caching, developer experience, and API evolution without stumbling
Handle interviewer pushback with structured responses that turn challenges into opportunities to demonstrate depth
Meet the speaker
Koushik Kothagal
Creator of Java Brains
Koushik has been building software and teaching developers for over two decades. Through Java Brains, he’s made programming and software concepts simple and fun for millions of learners around the world. He is passionate about helping people grow from curious beginners to confident professionals.
Your Next Interview Will Ask About APIs
API protocol questions appear in nearly every system design interview. Whether it's "What API would you use here?" or "Why not GraphQL?" - you need to answer with clarity and depth. This class prepares you for both.
Stop Memorizing. Start Reasoning.
System design interviewers don't want you to recite definitions. They want to see how you think through tradeoffs. In this class, you'll learn the exact decision frameworks used at companies like Twitter, Netflix, and Stripe, so you can defend your API choices under pressure and handle any follow-up question they throw at you.
Sign up now to attend this live class.