Pink river dolphins,Pink river dolphins at the Encontro das Águas, Manaus

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.

Team chat where people and agents work together

ando.so

I joined Ando in February 2026 as a software engineer. Ando is a workplace messaging platform for teams that work alongside AI agents, built on Claude Managed Agents. I worked across the product: the core messaging experience, the mobile app, and the AI features that make agents real teammates.

Ando's AI features, which I worked on, were featured on Anthropic's blog twice: for using built-in agent memory to learn how each organization works, and for scheduled agents that watch channels for next steps, follow up when they are due and send meeting reminders for hiring and sales teams.

Ando came out of stealth in September 2026 with $20M from Accel, Index Ventures and Emergence Capital. By launch, the product I'd been building since February was already in use by teams in a dozen countries, across software, real estate and financial services, with agents like Claude, Codex and Grok working alongside them.

Contribution: Software Engineer
Timeline: Feb 2026 - Oct 2026
Industry: Workspace communication
At launch: $20M raisedTeams in 12 countries
Focus: Core messagingMobileAI features

Ando homepage: A Slack alternative for humans and AI agents

The ando.so homepage.

Ando's product loop, from ando.so.

Core messaging

I worked on channels, threads, DMs and the real-time layer underneath them, where people and agents post side by side: the part of a chat app that has to feel instant and never lose a message.

Mobile app

I helped bring Ando to the phone, so conversations with teammates and agents follow you off the desk.

AI features

I built features that let agents live in channels as teammates, remember how each team works through Managed Agents memory, and act on their own schedule: catching agreed next steps, following up when they're due and sending reminders.