Co-founder & CTO — Grexal

GonzaloPelenur

Everyone calls me Gon. Harvard CS ’26, with honors. I love building stuff.

Gon — est. 2002

About

I like shipping things people actually use.

I'm Gon — a computer scientist and founder. I started coding when I was 14; now I'm 23 and still love building things. While finishing my CS degree with honors, I co-founded and built the technology behind an AI workspace, a dating app that 15% of Harvard signed up for, and a marketplace where AI agents do real work.

Some of my work,
so far.

Matilda↗︎

matildaml.com

A visual-aware AI workspace. Organize files into spaces and ask questions answered directly from your documents — with grounded citations, not hallucinations.

AI workspace
Grounded RAG
Citations

Circle↗︎

oncircle.app

A college-only dating app that sends students 1–2 high-compatibility matches a week instead of an endless swipe feed. Weekly question batches, moderated student-submitted prompts, and Celeste — an AI matchmaker who learns your values and deal breakers.

Matchmaking
AI matchmaker
College-only

15%of Harvard students used Circle

Grexal↗︎

Now buildinggrexal.ai

A marketplace for AI agents. Developers publish agents with our SDK and CLI and set a price for their work; businesses tell the Grexal orchestrator what they need, and it assembles the best agents into an automated workflow on an editable canvas.

Agent marketplace
Orchestration
SDK & CLI

Writing

Notes from building
with agents.

Long-form and technical, from a summer of side projects — what I actually built, what worked, and the parts I'm still not sure about.

The agent that files its own issues↗︎

Dead ends are the highest-signal product feedback there is. So I gave CreativeStudio — an AI film studio that produces documentary videos end to end — an unattended loop that turns them into GitHub issues, implements them with headless Claude Code, reviews them with a second agent, and ships them.

CreativeStudio · August 2026 · 6 min read

The website is just a view↗︎

MacroStack is the macro tracker I use every day. Every capability is an MCP tool first; the web app is one client among several. Design notes on tool budgets, context isolation, and OAuth for agents.

MacroStack · August 2026 · 7 min read

A render farm where the workers are Claude Code↗︎

My daily news videos are HTML compositions, authored end to end by headless Claude Code sessions on a leased job queue. Notes on orchestrating creative agents: write ownership, parting notes, and cost floors.

Newspresso · August 2026 · 7 min read

Teaching

Building is half the job. Explaining is the other.

I led my own section as a Teaching Fellow for ENG-SCI 30 — Harvard's startup course, “Startups: From Ideas to Exit,” taught by Zillow co-founder Spencer Rascoff and HBS professor Josh Lerner. Before that, I built an AI teaching assistant used by Harvard's Econ 50 (500+ students) as a researcher at Opportunity Insights, and developed course materials for two Harvard comparative-literature courses as a Generative AI Development Student Fellow.