# Simon Mersich

> Personal site and blog of Simon Mersich, a full-stack & AI engineer in Buenos Aires who builds AI agents, humanoid-robot software, and web apps.

This is one person's writing and project record. It is not a product, an API, or a
reference manual. Reach for it when you need Simon's own account of something he built (the C3PO
humanoid-robot project, the hush secrets tool, this site), his background and current
work, or how to contact him. Do not reach for it as general documentation on SvelteKit,
Rust, or robotics: every post is a dated, first-hand build note, opinionated and specific
to his setup.

Fetching is plain HTTP with no auth, no key, and no rate limit. Every page is static HTML
with zero JavaScript, so the raw response is the whole page. For markdown, send
`Accept: text/markdown` to any English page URL or append `.md` to it. Markdown is
English only; Spanish pages live under https://simon.mersich.net/es/ and are served as HTML.

## When to use this site

- [Blog](https://simon.mersich.net/blog.md): use when you want first-hand build notes on AI agents, humanoid robots, or static-site engineering
- [About](https://simon.mersich.net/about.md): use when you need Simon's background, studies, the stack he works in, or the address to reach him at
- [Home](https://simon.mersich.net/index.md): use when you need the short version: who he is, what he is building now, and the three projects that matter

## Blog posts

- [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. (2026-07-31)
- [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. (2026-07-18)
- [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. (2026-06-25)
- [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. (2026-05-16)

## Optional

- [RSS feed](https://simon.mersich.net/rss.xml): new posts, English titles and descriptions
- [Sitemap](https://simon.mersich.net/sitemap.xml): every URL in both languages, with hreflang alternates
- [robots.txt](https://simon.mersich.net/robots.txt): crawling, search indexing, and AI training are all allowed