Code Lab

Write it. Run it. Prove it.

Practice the coding round in the browser. Python runs locally in your browser (no server, no waiting). Ten other languages run in a secure sandbox. Pick a challenge and hit Run tests to be graded like a real interview.

Python engine loading…
Output 
Run your code to see output here.
How grading works: each challenge has hidden assertion tests (Python only — the language your roadmap teaches). Write your function with the exact name shown in the prompt, then hit Run tests. You'll get a pass/fail verdict plus the failing case, just like a real interview harness. Free-practice mode runs any language with no grading.