---
title: "Simon Mersich"
description: "Simon Mersich is a full-stack & AI engineer in Buenos Aires who builds AI agents, robots, and web apps."
canonical: https://simon.mersich.net/
language: en
---

# Simon Mersich

> Simon Mersich is a full-stack & AI engineer in Buenos Aires who builds AI agents, robots, and web apps.

I'm a 17-year-old full-stack & AI engineer in Buenos Aires. I build AI agents, robots, and web apps.

Right now I'm building C3PO, a project to give Claude a Unitree G1 humanoid body. The last thing I shipped was Lendy, an AI microcredit lender built at an Anthropic hackathon. I do most of my work in the terminal and Vim.

## Work

### C3PO

Giving Claude a Unitree G1 humanoid body: an MCP server, an agent backend, and a chat interface. It started in Isaac Sim and has run on real hardware since July 2026.

Source: https://github.com/mercho40/C3PO

### hush

A single Rust binary that keeps your .env encrypted inside the repo. Recipients are GitHub usernames, so there is no key exchange to run.

Source: https://github.com/mercho40/hush

### Lendy

An AI microcredit lender, built over a weekend at an Anthropic hackathon.

## Writing

- 2026-07-31 — [We still send .env files over chat](https://simon.mersich.net/blog/hush-encrypted-secrets.md): Every tool for sharing secrets asks you to give something up: an account, a server, a runtime, or a per-seat bill. So I built hush.
- 2026-07-18 — [Rebuilding my site with SvelteKit](https://simon.mersich.net/blog/rebuilding-my-site.md): From a Next.js template with a design system to a handful of hand-written files.
- 2026-06-25 — [C3PO, part 2: a real agent and a chat interface](https://simon.mersich.net/blog/c3po-2-chat-interface.md): From a Claude Code hack to a proper agent in the backend, with a chat interface for the robot.
- 2026-05-16 — [C3PO, part 1: Claude Code drives a robot in Isaac Sim](https://simon.mersich.net/blog/c3po-1-isaac-sim.md): Introducing C3PO, a project to give Claude a body. It starts with an MCP server and a simulated Unitree G1.

## Contact

simon@mersich.net

---

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