Senior-leaning Python Developer — AP Automation Core Engine

We're building Finaro, a B2B accounts-payable automation product for the Spanish mid-market. The document capture/OCR and extraction layer is already built. We now need a backend engineer to take the core matching engine and platform from a working reference implementation to a production service. You won't start from a blank page: there's a detailed functional spec and a working Python reference implementation of the deterministic 3-way matching engine (anchoring, matching cascade, balances ledger, tolerance comparison, scoring/routing, learning loop). Your job is to harden and productionize it. You'll work under our CTO, who owns architecture and reviews all code. Scope — this role is the engine + platform, NOT ERP integration. ERP connectors (Odoo, Telematel, etc.) are handled separately. Please don't apply if your background is mainly Odoo functional/configuration work.