Pyre Code provides 76 hands-on problems covering the internals of modern AI systems — attention variants, training algorithms, inference kernels, alignment techniques, and graph neural networks. Users write implementations in a browser-based Monaco editor, submit to a local grading service, and receive instant pass/fail feedback per test case. The platform includes optional AI-powered hints via any OpenAI-compatible API, reference solutions for comparison, and progress tracking across sessions. No GPU is required.