Senior Software Engineer- React Native

The free, open companion to the Grokking the System Design Interview course, published as a GitHub repository. It teaches a pattern-first approach: learn building blocks such as caching, sharding, replication and queues well enough that any design question becomes a matter of combining them. It includes a seven-step interview framework, 30 patterns, 59 question walkthroughs, company guides, cheat sheets and study roadmaps, all readable in the browser without an account.

• System design
• Job search

An interactive practice tool for system design questions: you work through a real-world design step by step on a whiteboard and receive AI-powered feedback on your answer. Your practice sessions are saved with their status, so you can return to them and review results. It fills the gap most preparation leaves open, which is actually producing designs under realistic conditions rather than only reading worked answers.

• System design
• Job search

A beginner JavaScript course that starts at hello world and needs no prior programming. Across 10 chapters and 41 text lessons it covers variables, operators, conditionals, objects, functions, strings, arrays, every loop form, and Maps and Sets, with 114 in-browser playgrounds and 39 quiz questions. It suits someone who wants a structured first language for web development and prefers reading and running code to watching videos.

• Web
• Programming
• Frontend

A course on object oriented and low level design interviews. It teaches a repeatable method (requirements, actors and use cases, class diagram, code) with UML basics and SOLID, then applies it to 22 case studies such as a parking lot, elevator, ATM, chess, movie booking, Splitwise and an in-memory cache, with runnable code in Python, Java and C++. It suits candidates facing a dedicated OOD or LLD round.

• Job search
• System design
• CS fundamentals

A seven-stage plan from how the web works to a shipped product: HTML and CSS, JavaScript and the browser, Git and build tooling, your framework (React with Next.js, Vue with Nuxt, or Angular), TypeScript and testing, performance, accessibility and security, then a real product with real users. It suits beginners, career switchers and backend developers filling in the browser side. By the end you can ship a typed, tested, accessible and fast app, deployed with CI and real people using it.

• Web
• Frontend
• Programming
• Testing

The official documentation for Expo, the framework and tooling most React Native apps now start with. It covers creating a project, a step-by-step tutorial app, file based navigation with Expo Router, the SDK modules for camera, notifications and more, and building, submitting and updating apps with EAS. It suits JavaScript and React developers moving to mobile, and it removes much of the native setup that used to make React Native hard for beginners.

• Web
• Frontend
• Mobile
• Programming