Guilherme Graça

Guilherme Graça

Software engineer at early-stage startups

Portuguese software engineer with 10+ years of experience building products with Ruby on Rails and React.

I'm currently at Fission, a fintech startup making tokenized funds liquid. Before that, I was an early engineer at Stepful (YC S21).

Outside work, I still make the occasional game and build my own apps.

Experience

  1. 2024 – now

    Fission · Engineer #2

    Building the product, from the web app to its integrations with EVM chains and Solana.

    Technologies: Ruby on Rails · React · GraphQL · EVM · Solana

  2. 2022 – 2024

    Stepful (YC S21) · Engineer #2

    Owned features across data, back office, student acquisition and graduation flows at a startup widening access to healthcare education in the US.

    Technologies: Ruby on Rails · React · GraphQL · BigQuery

  3. 2019 – 2022

    Vinterior · Software engineer

    Helped redesign the SEO and frontend infrastructure of a vintage furniture marketplace, working in 8-week cycles inspired by Shape Up.

    Took time off in 2020 to co-found Ripplr.

    Technologies: Ruby on Rails · Webpack · SEO · Web Vitals

  4. 2019

    Coatsink · MSc placement

    Researched AI systems with Unity's then-new DOTS framework during early development of a VR title, later released as Jurassic World Aftermath.

    Technologies: Unity · DOTS · Utility AI

  5. 2016 – 2018

    Whitesmith · Software engineer

    Client work at a product studio, from discovery to MVP to ongoing improvements, for clients including EDP, Brand Digital, Yardlynk and Supazaar.

    Also built Soundy, a "Giphy for sounds", at a team hackathon.

    Technologies: Ruby on Rails · React · Redux

Selected projects

  • January 2018 · Global Game Jam

    TCPanic

    A platformer about sending TCP packets and waiting for their acknowledgements, across neon Tron-style levels.

    Technologies: Unity · Post-processing

  • October 2020 · Startup

    Ripplr

    A social platform for sharing content found online, which I co-founded and launched during COVID.

    Technologies: Ruby on Rails · Vue · Vite · Kubernetes

  • January 2022 · Side project

    Belts

    An experimental 3D game engine for Ruby, with an entity-component design inspired by Ruby on Rails and Unity's DOTS.

    Technologies: Ruby · OpenGL · Game Engine

  • March 2019 · University

    Collect and Destroy

    A multiplayer game on a custom C++ engine. I built the engine core and networking, and set up code reviews and CI.

    Technologies: C++ · Networking · Bullet Physics

See all 20 projects in the showcase

Education and community