Adaptive skill practice — find your level, get sharper.

Software Development practice

Languages and frameworks — Python, Java, JavaScript/TypeScript, Swift, Kotlin, Go, C#, React, mobile, and more.

Software Development covers the languages and frameworks working engineers use every day — Python, Java, JavaScript and TypeScript, Swift and Kotlin, Go and C#, React and React Native, native iOS and Android development, Vue, CSS, Node.js, Next.js, web accessibility and performance, and the data structures, algorithms, and problem-solving patterns behind coding interviews. Questions are concept-first and adaptive, drawn from the official docs, so you’re building durable understanding rather than memorizing snippets.

• Meets you at your level — never too easy, never too hard.

• Adapts every question to how you’re doing.

• Tracks your level over time. Skill practice, not a test.

Skills in Software Development

Master the type system senior interviews test

The language fundamentals every interview returns to

Data Structures & Algorithms

The interview canon, from Big-O to DP

Coding Patterns

Design patterns and the principles behind clean code

The mental model behind hooks and re-renders

Web Development

How the web works, end to end

React skills, applied to native mobile

Dart and Flutter, from the official docs

The cascade, layout, and the modern layer — mastered

The reactivity system behind the templates

Web Accessibility

Build interfaces everyone can use — WCAG, ARIA, and focus done right

Web Performance

Make pages fast — Core Web Vitals and what actually moves them

Predict the output — and learn why Python does that

Predict the output — and learn Java’s sharp edges

Master the runtime behind server-side JavaScript

The App Router, from routing to the Next 16 caching model

DI, REST, and data — the backbone of Java backends

Optionals, protocols, ARC, and concurrency

Null safety, coroutines, and scope functions

Slices, interfaces, goroutines, and channels

LINQ, async/await, records, and the CLR model

iOS Development

SwiftUI, UIKit lifecycle, and shipping to the App Store

Android Development

Compose, lifecycles, and the Android platform model

More categories

Words & Language

Reasoning & Memory

Knowledge & Trivia

Creator & Media

Business & Economics

Careers & Licensing

Tools & Platforms

Computer Science

Also on your phone

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