Archie - Stefan

The Archie app: chat sidebar with saved interview sessions beside the live interview canvas.

A system design interview coach with a chat sidebar and live canvas. You describe a problem; Archie walks framing, requirements, capacity, API, architecture, and trade-offs — rendering diagrams and tables you can refine in place. Controlled generative UI: the model picks content, the product owns the surface.

Next.jsFastAPILangGraphCopilotKitReact Flow

Live demo Source

Archie interview canvas: a requirements table, capacity estimates with the arithmetic shown, and an approach comparison. — The canvas fills in as the interview runs. Capacity shows its own arithmetic.

Approach comparison weighing fan-out on write against fan-out on read, above a layered architecture diagram. — Trade-offs and architecture render as structured artifacts, not prose the reader has to parse.