In less than a year, designer Ryo Lu helped transform Cursor from a feature-layer on top of VS Code into one of the world's leading AI code editors. He joins YC's Aaron Epstein on Design Review to talk about the path that brought him to Cursor, how rapid prototyping reshaped the core product and how he's breaking down the barriers that once separated designers and coders. Chapters: 00:00 — Designers Becoming Builders 04:11 — Learning by Building, Not Studying 08:39 — Inside Cursor’s Design Team 13:30 — Designing Systems, Not Features 17:40 — Rebuilding Cursor Around Agents 23:15 — Prototyping With “Baby Cursor” 30:52 — Design as Sculpting, Not Painting 36:10 — The Future of Designers and Engineers