Courses
Interactive courses covering system design, programming languages, databases, and architectures.
The object model, this and binding, classes, the microtask queue, generators, modules and the patterns interviews actually ask about.
Learn JavaScript from the first line of code. Variables, types, operators, decisions, loops, functions, strings, arrays and objects, each one explained before it is used.
Execution contexts, hoisting, scope chains, closures and the event loop. How JavaScript actually runs your code, and why the quirks stop being quirks once you can see the mechanism.
How machines learn from data, from your first mean calculation through regression models and decision trees, and how to tell whether the model you built actually works.
Most people learn SQL by memorising syntax. This course teaches you how to think in SQL and that is the difference between copying queries and writing them.
Master system design through bite-sized lessons built for early-career engineers. Build scalable, bulletproof systems with hands-on projects and real-world case studies that make complex concepts click.