See how a J4 Upgrades buyer room should feel.

This demo uses public practice evidence, not a customer job. It shows the structure buyers should expect: scope, baseline, attempted fix, verification, limits, and decision.

Open the full public report →All practice attempts

SAMPLE: SYMFONY DEMO

1. Scan

Application: Symfony demo. Version path: Symfony 6.4.47 → 7.4.0. The scan identifies the target movement and confirms existing checks are available.

2. Fix

AI agents perform migration work and keep assertions intact. The buyer-facing explanation focuses on changed dependencies, compatibility edits, and known limitations.

3. Verification

Existing tests passed and the combined checks caught 5/5 seeded faults in this practice run. That makes the practice result green under J4's published bar.

4. Buyer decision

For a real job, the buyer would review the PR, evidence report, and agreed acceptance criteria. Payment would be due only after the agreed proof passes.

LIMITS

This demo does not prove that every Symfony upgrade, or any customer repository, will succeed. It is a sample of the reporting style and proof bar. J4 does not certify software as bug-free, secure, compliant, or production-ready.