Coding

Three drills for software-engineering interviews — pick the one you want to work on. Everything runs in your browser and your attempts are stored per-problem so you can track progress.

Coding Problems

LeetCode-style algorithmic drills

Hand-authored problems in Python, JavaScript, and TypeScript. Code runs entirely in your browser — nothing is sent to our servers until you choose to record your attempt.

Start solving →

System Design

Whiteboard-style architecture interviews

Design scalable systems with guided prompts, reference architectures, and an interactive whiteboard. Practice trade-off conversations and capacity estimation.

Open design board →

Code Review

Spot-the-bug + feedback drills

Read real code samples and practice giving constructive review feedback. Great prep for senior-engineering interviews that test code-quality judgment.

Review code →