Romain GABRILLARGUES
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The Cursor AI logo outlined in fine silver contours with subtle depth

RAISE Summit Hackathon.

Mantra explores how AI agents can test apps, compare variants, and help decide what to build next.

3rd place Google DeepMind track

Discover the project

Let the agent test your app.

Mantra explores a testing workflow for any kind of app under development: let AI agents use it, explore design variants, and report on the experience before a wider launch. Built as a team at the RAISE Summit Hackathon in the Google DeepMind track, the prototype demonstrates this workflow with a video game. Gemini Computer Use interacts with the game through a real browser, using what it sees on screen to play and report its findings. Cursor was the event's main partner.

Role
Game development & AI tooling
Type
Hackathon
Stack
TypeScript / Next.js / Three.js / Gemini / Playwright / Supabase
Status
Hackathon prototype
Year
2026

One continuous testing loop.

  1. Test

    Run parallel browser sessions through app interactions

  2. Vary

    Generate builds around explicit design hypotheses

  3. Create

    Produce ad-video concepts with Veo and Nemotron

  4. Decide

    Compare variants and recommend keep, iterate, or stop

Building the demo and its AI tools.

I worked on the Three.js game used by the agents, including its environment, animated characters, responsive interface, and rendering performance. I also built a Gemini-based video-tagging library with structured outputs and contract tests, giving the team a reusable way to describe recorded footage.

The Mantra team gathered around laptops during the RAISE Summit Hackathon

Building Mantra together at the RAISE Summit Hackathon.

3rd.

Google DeepMind track / RAISE Summit Hackathon

The team placed third in the Google DeepMind track. The demo connects browser playtesting, generated variants, and a decision dashboard. Its advertising integration creates paused test campaigns and uses seeded metrics; it does not demonstrate live campaign performance or paid acquisition results.

Certificate of Excellence awarded to Romain Gabrillargues for third place in the Google DeepMind track at the RAISE Hackathon, July 2026

Certificate of Excellence / 3rd place, Google DeepMind track / RAISE Summit Hackathon, July 2026

Google DeepMind track winners gathered for a group photo at the RAISE Summit Hackathon

With the Google DeepMind track winners at the RAISE Summit Hackathon.

A high-top inline skate with three straps and four wheels, sculpted from silver contour lines

Next project

Roller Loop.