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).
work/
Railblocks
Forward deployed engineer, 2026 - now
Working directly with investment firms and shipping what they need into their private AI operating systems.
Andobacked by Accel and Index
Software engineer, 2026
I worked on core messaging, mobile and AI features for team chat where people and agents work together.
Matricesbacked by Index Ventures
Software engineer, 2025 - 2026
I built reinforcement learning environments for the top AI labs.
idwallacquired by Serasa Experian
Software engineer, 2024 - 2025
Identity and fraud prevention for Brazil's largest banks. I rebuilt its auth and moved 1.5 million users.
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.