Challenges

Challenges & Interview Prep

Solve algorithm challenges in TypeScript or Kotlin, master React with hands-on challenges, or prep for interviews with React 19.

TypeScript & Kotlin Challenges

HackerRank-style algorithm problems. Solve in-browser, run and verify with automated tests.

94 challengesTypeScript + Kotlin

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React Challenges

Master hooks, rendering, TypeScript patterns, and performance. Solutions unlock after 10 attempts.

98 challengesReact + TypeScript

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React 19 Interview Prep

Master React 19's revolutionary features through interactive lessons with live code editors and previews. Perfect for interview preparation.

15 LessonsReact 19 Features

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Spring Reactor Challenges

Master reactive programming with Kotlin: Mono & Flux, operators, backpressure, error handling, WebFlux, testing, and resilience patterns.

40 challenges10 topicsKotlin

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Kotlin Data Structures

Master data structures with 110 Kotlin challenges: arrays, linked lists, stacks, queues, trees, graphs, heaps, and more. Learn why each structure matters with SVG diagrams and step-by-step explanations.

0 challenges1 topicsKotlin

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