Automating Legacy Modernization with Antigravity: A Hands-On Workshop

How can a team of AI agents modernize a legacy application without drifting away from its real behavior?

In this hands-on online workshop, we will use Google Antigravity and a five-phase agentic pipeline to reverse-engineer a legacy Express and Mongoose application and rebuild it as a typed Next.js application. You will work through audit, test-driven development, backend scaffolding, UI generation, and browser-based parity verification.

What you will learn

• Separate deterministic setup work from reasoning-heavy modernization work.
• Use Router, Plan-and-Execute, and Reflexion patterns.
• Coordinate specialized agents with explicit input and output contracts.
• Generate tests before rebuilding application behavior.
• Verify functional parity and probe the result for regressions.

Who should attend

Developers comfortable with JavaScript or Node.js, Git, and basic terminal commands. Previous Antigravity experience is not required.

Schedule

The Discord room opens at 10:15 a.m. Eastern for technical checks. The workshop runs from 10:30 a.m. to 1:30 p.m. Eastern.

• 10:15–10:30: Discord room opens for technical checks
• 10:30–10:42: Welcome, objectives, and environment verification
• 10:42–10:57: Router, Plan-and-Execute, and Reflexion patterns
• 10:57–11:05: Express-to-Next.js modernization architecture
• 11:05–11:35: Phase 1 — legacy application audit
• 11:35–12:20: Phases 2–3 — tests, data layer, and API scaffolding
• 12:20–12:30: Break
• 12:30–12:55: Phase 4 — modern UI and pages
• 12:55–1:15: Phase 5 — parity and adversarial verification
• 1:15–1:27: Review, discussion, and Q&A
• 1:27–1:30: Feedback poll and closing

This is a working session rather than a passive webinar. Registration is limited to 25 participants, and the session will not be recorded. Prepared checkpoints will help you rejoin the group if an individual AI run falls behind.

Before the workshop

Install Google Antigravity, Node.js 18 or newer, Chrome, and Git. Then complete the attendee setup guide before event day.

You can also add this workshop to your calendar and bookmark the official Google codelab.

Discord access is provided to registered attendees.