Catch bugs.
Build instinct.

A new habitat for
interview practice.

Debug real code with an AI partner.
Test your fix. Learn from what you missed.

Real code.
Something’s off.

Start with a working project that has a few hidden bugs. Read the code, ask questions, and test your ideas.

Rate limiterPython

# When should a request expire?

while window and (
    now - window[0]
    < self.window_seconds
):
    window.popleft()

Find the boundary case. Make the tests pass.

Review your test results, code changes, and hints in one debrief. Come back for another challenge when you’re ready.