Pontus Abrahamsson

Midday is joining Ramp

We started Midday to build something we wanted for ourselves and it grew into something much bigger than we expected.

And here is the story behind it 🧵

some fun tech challenges to make this really smooth:

- Agent writes a tiny DSL, client expands it to shapes
- Edits are one-line patches
- Revision CAS + per-element merge
- Agent proposes suggestions you keep or dismiss
- Pinned comments the agent reads and clears
- Post-it shadows and pins with CSS vars for zero re-renders
- Excalidraw as a lazy headless canvas

gave Glass a whiteboard. built with headless Excalidraw. (WIP)

Artifact viewer, done right:

- Supports all major formats
- Loads on idle, renders only what's on screen
- Web Workers for heavy computation
- Select text, comment, and the agent edits it
- URL-based state
- Keyboard shortcuts

Make your app feel instant.

React.lazy waits up to 300 ms to show code it already downloaded.

Preload on hover and skip React.lazy. About 2 ms instead ⚡