German Quintela

Working where design meets code

I'm currently a founding engineer and designer at Concourse, where I've helped take the product from zero to Series A owning everything from product design to shipping complex Front End implementations. I led design systems implementations at MercadoLibre, shipped React Native and web projects at Aerolab and built crypto and NFT products at LocalCoinSwap and Polemix.

& various talks at companies on creating and scaling design systems, given as co-lead of Friends of Figma's official Buenos Aires chapter from 2020 to 2022.

  1. 2024 — Present

    Concourse AI

    Founding engineer and designer, helping take the product from zero to Series A through three pivots in search of product-market fit (PMF). I led the frontend team while owning product design end to end — from the interface to every frontend integration.

    Stack:
    • Vite
    • React
    • React Query
    • Zustand
    • Zod
    • Next.js
    • Tailwind

    Concourse AI

    Founding design & engineering — from zero to Series A, owning product design through to shipping AI-powered features.

    Pulling finance records…

    Agent workflows

    A live agent run — switch the pattern the pixels trace, and the status it reports, with the buttons below.

  2. 2021 — Present

    LocalCoinSwap

    Helped build three crypto products for different regional markets, owning design and frontend across all of them.

    Stack:
    • Svelte
    • Tailwind
    • Privy

    Ongoing Redesign

    Drag the divider to wipe between the original LocalCoinSwap homepage and the redesign.

    slide to swap

    Slide to swap

    Non-custodial trading UX — a drag-to-confirm swap control that commits the trade only on a deliberate, full-length slide.

    Trading flows

  3. 2022 — 2024

    Polemix

    An experimental NFT startup: handled smart-contract signing and NFT minting, and built experimental ways to visualize NFTs on the frontend.

    Stack:
    • Next.js
    • Tailwind
    • Zustand

  4. 2021 — 2022

    MercadoLibre

    Worked on the CX team across both the frontend and the BFF, and led the creation of the design system for a customer-support chat.

    Stack:
    • React
    • TypeScript
    • Storybook
    • Node.js

  5. 2020 — 2021

    Aerolab

    Built all kinds of projects — from React Native apps with 3D animations to Stripe-style marketing sites in Next.js — always focused on accessibility and performance.

    Stack:
    • React Native
    • Next.js
    • Tailwind

  6. 2018 — 2020

    Encender

    Built marketing landing pages, Salesforce integrations, and internal client platforms for companies like Bayer, Nespresso and Monsanto.

    Stack:
    • React
    • SASS
    • PHP

Connect

Feel free to reach me at

Before leaving give some love to Bold, my black cat