01
Ventana Lunar
When can you land at the lunar south pole? Windows of sunlight and of contact with Earth, on a 3D globe built on NASA data.
2026 · NASA Space Apps · Astro, Three.js
See it live : nasa.cervilla.esJavierCervilla
Product, AI and software that make it to production.
Tonight’s Moon. Drag it to change the date.
- Illumination
- Age
- Elongation
- Distance
01 / What I do
From the problem to production.
01
Custom product
Websites, apps and integrations, from design to deployment, with the same team from start to finish.
Where to see itNoorTercer TiempoMareia
02
Applied AI
Agents and automation that do real work, with a person approving what matters and tests you can watch fail.
Where to see itUAETaxAgentWinnowAgenticFramework
03
Crypto and Bitcoin
Where Universelle comes from: tokenisation, Bitcoin Stamps and SRC-20, from the most widely used Stamps indexer to a launchpad of our own.
Where to see itThe Bitcoin Stamps indexerSRCPAD
02 / Work
Seven things in motion.
02
UAETaxAgent
An agent that prepares a UAE small business’s VAT return and files it only when a person says yes.
2026 · Create AI Agents Championship · Hono, LangGraph
See it live : eautax.cervilla.es
03
Noor
The website of Noor, who works in fashion, communication and creative production: its own art direction, with her name written in lace and objects you can drag around the page.
2026 · Custom website · Astro, Tailwind
See it live : whosnoor.com
04 · Open source, AGPL
Mareia
Tides and almanac for 153 Spanish ports from its own harmonic engine. Every figure says where it comes from and how far off it can be.
See it live : mareia.cervilla.es
05 · Product
Winnow
A GitHub App that finds dead code, measures quality and keeps the docs in step with what is actually used.
See it live : winnow.srcpad.pro
06 · Product
Tercer Tiempo
Votes, ratings and player cards for amateur football teams. You vote from the WhatsApp link, with nothing to install.
See it live : thirdtime.es
07 · Game
Cold Trap
A strategy game on the real Moon: your base has to survive the lunar night at the south pole. Plays in the browser.
See it live : coldtrap.cervilla.esAlso
- AgenticFrameworkThe agent swarm I work with: separate roles, deterministic gates and a dashboard where everything shows.Private
- HilvánAI suggestions for the text fields of Sveltia CMS. It never changes anything on its own.Open source
- VideoStudioFinished videos from a marked-up script: voice, deterministic scenes and frame-by-frame rendering.Private
03 / Path
Logbook.
2019
42 Madrid
I learn to program at 42 Madrid: C from scratch, with no teachers and no classes, only projects and peer review. That is where my way of working comes from: code passes when someone else has tried to break it and couldn’t.
Projects from the cursusft_printf · cub3D · minishell · ft_services · pipex · philosophers · C++
2021
Universelle
We found Universelle in Madrid: a software, AI and product consultancy with roots in crypto. I lead its technical side, a small senior team that designs and builds end to end, with no hand-offs.
Puebloo
With Moisés de la Calle and Gonzalo Martín I co-found the social network for Spain’s villages, built against rural depopulation. Over 40 town councils and 6,000 users in under a year.
“Three young people created a rural social network that sets out to value the country’s villages and stop depopulation.”
Infobae, 27 April 2022, translated from Spanish In the pressInfobae65YMÁSEscapadaRuralMetro LibreAndalucía Rural
42 Madrid Token Week
We go back to 42 Madrid with Universelle, invited by the school and Telefónica Tech, to walk through how a token is launched. We give away the 42 Madrid Metaverse Pass: an NFT that unlocks the docs to program your own with ERC-721 and ERC-1155.
First NFT collections
Renaissance, the artist René Mäkelä’s first collection, and NOX’s, the first padel brand to step into the metaverse.
2022
BCNHack · Ethereum Barcelona
We win the Social Goods challenge at the official hackathon with Kindly, a working MVP built in three days that helps NFT projects meet their taxes while backing charitable causes. In September we present it at Data Natives in Berlin.
Metaverse Fashion Week
Third prize on the Decentraland community runway with Le Papillon, a wearables collection inspired by the work of Ángel Haro.
2023
RareStampArchive
We launch the Bitcoin Stamps marketplace aggregator, built entirely by our team: over 30,000 visits in its first month and mentions in Nasdaq, Bitcoin.com and Bitcoin Magazine.
The Bitcoin Stamps indexer
With Stampchain we build the most widely used Bitcoin Stamps indexer in the world: full APIs and large-scale support that KuCoin, Leather, Emblem Vault and Collab Land rely on.
2024
SRCPADArchive
We launch the launchpad for SRC-20 projects. Its token, SPAD, sells out the private round in five days and the public sale in two seconds.
The SRC-20 study
“SRC20 vs BRC20: The Battle of Permanence, Cost & Efficiency”, our comparative study of the protocols: over 120,000 views and articles on Bitcoin.com and Binance.
2026
NASA Space Apps and the Create AI Agents Championship
Ventana Lunar, for the NASA Space Apps Challenge, and UAETaxAgent, for the Dubai Chambers Create AI Agents Championship.
Now
Building with agents
I like problems that end in a number: a tide, a landing window, a VAT return. I work with a swarm of agents, but whatever reaches production first goes through tests you can watch fail.
04 / Contact