Surgical AI Execution

The failure revealed the true methodology: AI requires an architect to define the boundaries.

I changed tactics. I deconstructed the legacy endpoints, extracting only the isolated Java logic, database queries, and expected JSON responses for one specific endpoint at a time. I crafted highly constrained prompts and handed them to the AI.

The first endpoint was flawlessly replicated in FastAPI within 5 minutes.

Iterating rapidly, I guided the AI through the remaining core integration endpoints. What would have traditionally taken weeks of manual, soul-crushing translation was completed in under three hours. We ran the new API against the frontend UI, made minor adjustments, and achieved perfect parity.