Prove your skills

Structure, layout and responsive styling — the foundation of every web interface.

The language of the browser: types, scope, arrays, async work and the DOM.

Components, state and hooks — and the rules that keep an app fast.

Templates, reactivity, components and the router.

The language itself — arrays, strings, objects, errors and safe web handling.

Routing, Eloquent, Blade, validation and the framework habits that matter in production.

Core language, data structures and the standard-library habits of someone who has shipped Python.

The runtime, npm, modules and building an HTTP service with Express.

The language, the object model, collections and modern Java.

The contract between a backend and every browser, phone and service that calls it.

Widgets, state and getting a signed APK onto a real phone.

Kotlin, the component lifecycle, and shipping a signed release build.

Modelling data, querying it correctly and keeping it fast.

Documents, queries, indexes — and when a document store is the wrong answer.

The everyday commands, branching, and getting yourself out of trouble.

The shell, permissions, services, and the things that break at 2am.

Images, containers, volumes, networking and Compose.

Configuring outgoing mail for an application — and getting it into the inbox.

The holes that actually get exploited, and the defences that actually work.