Interface builders

When your product needs to give users creative control — whether that's building pages, designing workflows, or configuring complex rules — off-the-shelf solutions stop working quickly. The moment users need more than a settings panel, you need a real builder: one with drag-and-drop, undo/redo, live preview, and the ability to serialise and restore user-created layouts reliably.

The challenge is that builders feel deceptively simple until you're six months in and refactoring your state model. Getting the architecture right from the start — the component tree structure, the action/history stack, the rendering engine — is what separates builders that scale from ones that become unmaintainable.