Building companies is my art. It's how I express love.
Barcelona · San Francisco · B. 1997
Alejandro Rosas. Co-founder and CTO of Didit (YC W26), co-founder of Santé, identical twin. I love my people, the sea and the mountains, the art of creating, and the idea of a future among the stars. This page is all of it.
Some people paint. Some people write songs. I build companies.
A company starts as nothing: a blank page, two brothers and a problem. Then it becomes a place where people do the best work of their lives, and something strangers rely on every day. That is the most beautiful thing I know how to make.
It's how Iexpress love.
I build with my brother. I build for my sisters, Alba and Andrea. I build for the people who give us years of their lives, and for people I will never meet. Every late night is a way of saying I care about this, about you, about what comes after us.
Some people say it. I ship it.
There is no greater purpose than shaping a better life, not only for yourself, but for those who will walk this earth long after you're gone.
Creation, especially when done as a team, transforms you. It pushes you to grow, to understand others, and to connect more profoundly with the universe itself.
2 months deep in the cave, listening good techno, mind in Jupiter and coding like Picasso.
02 · Twin
There are two of me.
Alberto is my identical twin. My co-founder, my training partner, my rival and my best friend, all in one person. More than 10 years building companies together. Every company I have ever started, I started with him.
One of these is me. Good luck.
AlbertoCEO
Sales. Fundraising. Hiring. Everything outside the building.
Just getting started. Unstoppables.
Him on us, October 2026
Same shirt. Same glasses.
AlejandroCTO
AI models. Infrastructure. Product. Everything inside it.
Always pushing the limits with my twin. No dream is out of reach when you back it with pure focus, passion, and energy.
Me on us, September 2026
Quién es quién? With our cousin Adrian.San Francisco
At eleven we were building websites and brute-forcing our neighbours' wifi. We promoted clubs in Barcelona we were too young to enter. We studied together, we share bank accounts, and we have made about 20 angel bets together. There are no politics between us, because there can't be. Building with him is the purest form of love I know.
Same black t-shirt.May 2023. On stage, launching Didit.
Four of us
Alberto is not the only one. I have two sisters, Alba and Andrea. Alba grew up with us. Andrea came 15 years later. Four kids, one family. Everything I build, I build with them in mind.
1997
Two bouncers. Two of us.Alba, Alberto, me and our cousin Adrian
From Barcelona to San Francisco. The one that failed is on this list too. It taught me the most.
11My age at our first website
3Companies founded with Alberto
~20Angel bets, together
10+Years building, side by side
Age 11Websites. With Alberto. Plus brute-forcing the neighbours' wifi and playing around with malware.
BarcelonaClub promoters, in venues we were too young to enter.
2017New Mexico State, on a tennis scholarship. Self-taught in AI from here on.
First jobOracle, Silicon Valley. A mathematics degree, then building recommendation engines.
2021 → 2023
Gamium
The one that failed
It started with GPU farms mining Ethereum. Then came the biggest idea we could find: a metaverse where your avatar was your identity and your data belonged to you. We were 24.
~€3MRaised
€1MOf virtual land sold in 10 days
33People at the peak
July 2022. Wayra, Telefónica's innovation arm, invested.The Gamium crew
We had press, investors and 33 people. We did not have product-market fit. It failed. Best education I ever paid for.
Make mistakes and learn from them. Think about life beyond your lifespan. You are here now to build a better future for tomorrow. Take risks and give your best!
2023 → now
Santé
The one you can touch
Proof that building isn't only software. One clinic on Diagonal, in Barcelona. Then Madrid. Then our own lab. Longevity and aesthetic medicine, built with the same obsession as everything else.
Gamium died. One idea survived: proving who you are online is a human right. Didit is infrastructure for identity and fraud. I lead the engineering, and every AI model in it is built in-house.
3,500+Companies
$7.5MRaised
W26Y Combinator
ProfitableWith about 20 people
May 2023Launch. After 8 years reading Xataka every day, it was our turn to be on it.
Jan 2024Spain's financial sandbox. The Treasury later attested it as safer than verifying in person.
Nov 2025Y Combinator. We grew up watching their lectures online. Then we got in.
2026$7.5M, San Francisco. Barcelona roots, built to compete with the best in the world.
Y Combinator Demo Day, with AlbertoOut in the worldBuilding, side by sideSan Francisco
We left to compete where the most ambitious people on earth are building. No network, no family money. Just each other.
The trip where we decidedThe gateY Combinator
Welcome, USA, el país de las oportunidades, donde uno puede ser uno mismo y soñar en grande.
The land of opportunity, where you can be yourself and dream big.
People of 18 who dropped out to build. We film it all, raw and honest: how we went from pretty lost to building technology companies against the brightest minds around.
Humble enough to realize how tiny we are in this universe. And that's the beauty of it, it reminds you not to take life too seriously. Enjoy the game and play it exactly how the fuck you want to.
I love my people. You are the average of your five closest friends, and I got lucky with mine. Same table, same dance floor, same bad ideas, for years.
September 2026Summer '24, with a bunch of animalsBodrum, 2026BarcelonaLos años pasan pero seguimos igualBodrum, 2026
05 · Nature
Through my lens.
The sea and the mountains are where I go to feel small. I take portraits of them, and of the buildings people dared to make. Every photo here is mine. Click any of them.
Nature
Eidfjord, NorwayWhat a day to be aliveNorwayLake TahoeKelingking, Nusa PenidaNorwayUbud, BaliGili TrawanganIbizaNaplesBaliNorway
Born in Barcelona in 1997. I jump out of planes, box, play tennis and dance to techno stone sober. It is the same fire as the companies. Life is too good to watch from the side.
Black · Symmetry · Space · Post-AGI futures · Sea · Mountains · Techno
Sky
Out of the plane.
Skydiving first, then wingsuit. Same reason as everything else on this page: I want to see it myself.
Out of the door.
Sport
Since I was five.
New Mexico State, 2017. Let's go Aggies.
Tennis
7am cada día. No hay secreto, sólo constancia.
7am every day. No secret, just consistency. It took me to a scholarship in the US, and I still play.
Boxing
Repetition leads to perfection.
Underground
05:19. Zero alcohol.
Amsterdam, five in the morning, shirtless, stone sober. I stopped drinking during COVID and have not had one sip since. Techno never needed it.
Press it, turn it up. The loop is synthesized live in your browser.
07 · Cosmos
The biggest secrets are still out there.
We have set foot on one moon. The rest of the galaxy is still waiting. I want to see humanity out there, exploring it, and I want us to answer the biggest questions there are.
Shot by me. As far as we have walked.
What is the universe made of?
How did it begin?
What is consciousness?
Are we alone?
How far can we go?
A future like that gets built by people who refuse to stop. That's the work. Everything on this page is practice.
Dreaming higher than ever, not even death can stop a passionate soul in search of the light.
