Judging Takes Minutes. Design the Demo Accordingly.

The scale explains the situation. The GKE Turns 10 hackathon drew 4,773 participants from 133 countries, the ADK hackathon 10,400 from 62 countries, and GitLab's event over 600 entries. Judging that volume leaves little time per project. The reason winner write-ups compress into a single figure or a single phrase is that this is the shape that survives judging.

Read the top entries and the value states itself in one sentence. Cart-to-Kitchen: your grocery cart becomes tonight's dinner. Gitdefender: finds the vulnerability, writes the fix, opens the merge request. OrgLens: finds who knows, and lets you ask their digital twin before you bother the person. None of these need explaining. A build whose value only emerges after you enumerate several features is at a structural disadvantage.

Takeaway: write your project as one sentence before you start building. If that sentence needs a footnote, reconsider the subject or the scope. Open the demo with the single feature that lands hardest and keep the rest in reserve for questions. And where judges operate the software themselves, as at the All-Japan AI Hackathon, design what happens the instant they touch it — the first ten seconds decide it.