Leasing OS Leasing OS

Overview

Prototyped a full-stack, multi-actor platform for a Mexican equipment-leasing fintech in which a 10-step origination state machine advances only when the responsible party's evidence exists in the database.

Highlights

1. 01

   Built four role-scoped consoles (operator, funder, supplier, lessee) on Next.js 16, Prisma and Postgres, where every step is an anti-fraud gate re-derived on the server and each transition appears live to all actors.

2. 02

   Implemented deterministic pricing, credit, e-invoice, serial-number, residual-value, ESG and bank-account modules, covered by nine Vitest evaluation suites, plus a hash-chained audit ledger per leased asset.

3. 03

   Produced the viability report, the technical specification and a Phase-1 integrations study (32 sources, 75 adversarially verified claims) that maps build-vs-buy choices for payments, e-invoicing, KYC, AML and e-signatures.

Stack

• Next.js 16
• React 19
• TypeScript
• Prisma
• PostgreSQL (Neon)
• SQLite
• iron-session
• Server Actions
• Zod
• Vitest
• react-leaflet
• Finite-State Machine