# Donkers

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Jaydon Kua](https://cerebralvalley.ai/u/jaydonn)
- **GitHub:** https://github.com/jaydonnnk/backfill
- **Demo video:** https://youtu.be/UmRUxWfwo1g
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2615

Every café knows the 3pm feeling: the coffee machine is warm, the staff are paid, and yet half the tables are empty.

Today’s fix is to go on a deals platform, post a discount and hope. Our project targets the Singapore market. In Singapore, Eatigo and Grab offers are built for people scrolling an app. The café pays with its margin whether one person turns up or twenty, and the customer relationship belongs to the platform.

Backfill flips the deal: the discount only unlocks when the table count makes it worth it.

The owner snaps a photo of the menu and sets the rules: which hours, how many people are needed before the offer goes live, and a private price floor that buyers never see. Then the offer is open to the personal AI agents people are starting to shop with, like Muse. Agents commit on behalf of their humans, and when enough of them commit, the deal unlocks for everyone. If too few commit, the café gives nothing away.

Three things make this different:

It’s group demand, not a coupon. A deals app sells one discounted seat at a time. Backfill gets independent buyers to fill a quiet hour together, so the owner knows the discount is paying for a fuller room. 
It’s built for agents, not another app. Nobody has to download anything or hunt for deals. You tell your agent “cheap coffee with friends near Tiong Bahru on Thursday”, and it finds the offer and negotiates within your limits.
The owner stays in charge. AI can read the menu, draft a counter-offer and suggest new terms after a sellout, but it can’t set the final price. Code enforces the floor and capacity, and nothing changes without the owner’s approval. Backfill gives the neighbourhood café a way in, on its own terms.

## More from Meta Global AI Developer Hackathon

- [MemPlug](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2612)
- [hannibal](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2613)
- [Quint Team](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2614)
- [PiSpace Innovations](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2616)
- [Ron Bee Software](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2617)
- [Velvora Nexus](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2618)

---

Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2615. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt