Gemini XPRIZE finalist uses AI auditor to recover VAT credits for Mexican businesses
PeterDiamandis · x · 2026-09-23
TICIAN Cierre, a Build with Gemini XPRIZE finalist, helps Mexican SMEs recover VAT credits.
- Recovering VAT in Mexico means assembling an eight-part SAT filing, reconciling every CFDI invoice against bank statements — work that takes firms weeks per month, so many businesses never claim what they're owed.
- The tool processes CFDIs, reconciles against the bank, assembles the SAT file, then submits its own output to a Vertex AI auditor on Cloud Run that approves or rejects with reasons and specific findings (missing UUIDs, duplicates, VAT mismatches).
- Key design decision: Python does the arithmetic, not the model — models are bad at adding but good at judging; the deterministic sums travel back inside the response so anyone can audit that the model didn't invent totals.
- Stack: Python/FastAPI + Cloud Run + Vertex AI, with the reconciliation engine in Docker on a VPS using a minimal-permission service account.
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