martin.fantinelli

// fullstack software engineer

Martin
Fantinelli

Building fast, reliable products for teams that ship. Based in Porto Alegre, Brazil — working with clients worldwide.▍

  • Java
  • Spring Boot
  • TypeScript
  • React
  • Node.js
  • Rust
  • PostgreSQL
Porto Alegre, BR · --:--Scroll
// selected workProjects

Feixe

2026

SaaS · AI models

Chat with any open model on Hugging Face, from trending releases to community fine-tunes, paying in reais per message. Also ships an Anthropic-compatible API and a CLI to run Claude Code on open models.

  • Next.js
  • TypeScript
  • Hugging Face
  • Drizzle

Proventa

2026

Fintech · Crypto accounting

Audit-grade crypto wallet proof for Brazilian accounting firms. Wallet ownership is verified on-chain via EIP-191 signatures — no private keys ever leave the client — and movement reports are exported with an append-only hash chain.

  • Next.js
  • TypeScript
  • Ethereum
  • LGPD

Tonto's Cookies

2025

E-commerce · Food & beverage

Online ordering experience for a New York-style cookie shop in La Plata. Customers build their order by flavor, then checkout through Rappi or WhatsApp — no cart friction, no account required.

  • Next.js
  • TailwindCSS
  • TypeScript

Nutallo

2025

Web app

A client project built and deployed on Vercel. Replace this description once you add the real details about what Nutallo does.

  • Next.js
  • TypeScript
  • TailwindCSS

POA PetCare 24H

2023

Healthcare · Veterinary

Marketing site for a 24/7 veterinary clinic in Porto Alegre. Highlights emergency care, full surgical facilities and specialist coverage, giving pet owners confidence to reach out at any hour.

  • Next.js
  • TailwindCSS
  • TypeScript

Atehra

2026

Fintech · AI financial operator

AI that runs the financial back-office of Brazilian businesses. Connects to banks, gateways, ad accounts and sales platforms, unifies every transaction into a single model, and answers natural-language queries — no spreadsheet required.

  • Next.js
  • TypeScript
  • TailwindCSS