AI Product Builder
AI you can trust.
Agentic and generative products, built with a human in the loop — and built to be trusted.
About
A human in the loop, always.
Junior Villegas builds AI products the way other people read at night. By day he is an operator and executive; after hours he ships — turning the frontier of agentic and generative AI into things ordinary people can actually use. This is the lab where that work lives.
Every project here began as a question. Can an agent be trusted with my money and my inbox? Can a child describe a game out loud and simply play it? Each ended as a working product — designed, engineered, and shipped end to end. The throughline is a conviction that AI is most interesting in service of a person, with the human kept firmly in control.
- Focus
- Agentic AI · Generative AI · Consumer product
- Currently
- Building & shipping AI side projects
- Based in
- Miami, FL
- Toolkit
- Claude · Next.js · Expo · Supabase
- Stance
- Human-in-the-loop, always
6 products. Built end to end.
Each one shipped solo — from the model’s reasoning to the brand on the box.
Agentic AI · Consumer
Tend
Life admin, handled.
A life-admin autopilot that captures a messy obligation, finds the real way to act, drafts the reply — and waits for your yes.
Learn more
Agentic Reasoning · Fintech
Arbiter
Arbitrage intelligence for prediction markets.
Scans Kalshi event markets for risk-free arbitrage with exact-cents math, then reasons over the non-obvious mispricings.
Learn more
Generative AI · Kids
Bibo
Say a game. Play a game.
A tablet robot a 6-to-9-year-old talks to. They describe a game out loud; Bibo builds it, and it plays.
Learn more
Generative AI · Vertical B2B
Remodel Studio
Photograph the room. See the after. Price it.
A contractor photographs a room; the app renders the remodel, prices it from a real cost book, and schedules the build.
Learn more
Agentic AI · PropTech
OneView
Every document, one screen.
A property team's command center for The Easton Group — type a property, tenant, vendor, or check number and see every check, invoice, lease, and compliance record in under a second.
Learn more
Agentic AI · E-commerce
Margin
Retail arbitrage, end to end.
A single-operator Amazon arbitrage engine: it watches retailer prices, matches them to Amazon listings, computes the true landed margin, and ranks what's actually worth buying.
Learn morePractice
What I build with.
Agentic AI
Multi-step reasoning systems that plan, route, and act — with a person approving every consequential move. Extraction, deterministic guardrails, and structured outputs that never trust the model blindly.
Generative AI
Turning models into product: structured generation, image-to-image editing, and voice-to-artifact pipelines — each validated against a schema and shipped behind a clean, calm interface.
Full-stack product
From schema to ship. TypeScript end to end, Next.js on the web, Expo / React Native on device, Supabase on the back end — running on real phones, not just in a demo.
Product & taste
Brand, voice, motion, and the editorial polish that makes a prototype feel like a product people trust. The details are the work.