Pink river dolphins, drawn in type, swimming where the dark Rio Negro meets the sandy Solimões near Manaus. Tap the water to make ripples, or tap a dolphin to make it dart away.
Pink river dolphins, Encontro das Águas (photos, opens in a new tab)

Olavo Martsinkevich,

I love building with startups, taking products from zero to one, and from one to a million users. Everything from agent infrastructure to the small details people notice without knowing why. Based in Brazil.

Right now I'm a forward deployed engineer at Railblocks, helping funds like a16z and Paradigm run their own AI operating systems. Before that I built AI-native team chat at Ando (featured on Anthropic's blog) and RL environments for frontier labs at Matrices (covered by The New York Times).

Write to me at , or find me on LinkedIn and GitHub.

work/

earlier/

  • 2022-2025

    SASI Software Developer

    Built communication apps for state and city governments, with over a million downloads, and an AI assistant for 400,000 users.

  • 2024-2025

    Venturus Software Developer

    Led a front-end team of four on an admin platform for electric vehicle charging, and cut page load times by 30%.

  • 2024

    Objeto: Technology for good Software Engineer

    Built natural language querying over a database with millions of entries, from Toronto.

  • 2021-2022

    Caviar Criativo Web Developer

    Built interfaces for 15 clients in Manaus to WCAG accessibility standards.