Rayan Castilla

model interp, CS + FinTech @ Georgia Tech

[Rayan Castilla @rayancasz]

@GaddipatiHarsha @CookOut @DhruvRoongta @0xharsh_ put me on. can guarantee it IS that good

[Rayan Castilla @rayancasz]

@tryresult this is next-level!!!

[Rayan Castilla @rayancasz]

@0xharsh_ @_anishgupta_ @GaddipatiHarsha @SahilLalani0 bro no chance 😭😭

[💻 @adrian_dev]

Por eso España no tiene a alguien como @levelsio o similar todavía.

Le caería la más grande.

España -> Que a nadie le vaya mejor que a mi.

Mentalidad de pobre te mantiene pobre.

Aquí se nota todavía más, aunque ya es algo europeo y viene de la envidia a USA y China.

Y es normal, nos vendieron que éramos mejores por regular mil cosas y mientras nos jodíamos a nosotros mismos el resto ha despegado.

Me da pena la gente que se compara con alguien que le va bien y lo primero que hace es buscarle la trampa para quitarle mérito, en vez de fijarse en qué hizo y copiárselo.

Lo mismo que le pasó al chico que vibecodeó la web de los trenes en live, ofendidos con "te crees que tu proyecto es mejor que X...??!!!

Triste realidad, y no sé ni por dónde empezaría para cambiarla.

[@levelsio @levelsio]

Some people say they don't believe these numbers

So calculate it for yourself:

~115 deaths ÷ ~35M high speed train trips
=
1 in 300,000 is the statistical odds of death per trip in a Spanish high speed train this year

You can then argue "why do you cherry pick only this year", well because it happened this year! It's new information and you have 2 highly similar fatal accidents happening in one year meaning the probability that's random is almost zero

It's like saying after the 737 Max crashes that killed 346 people in 2018/2019

"That's just a random statistical oddity, I'll board the next one immediately"

Of course you wouldn't

What you'd do is board none at all until it's fully investigated why they crashed and the cause is solved, like the FAA did exactly by grounding them

To all the Spanish nationalist keyboard warriors attacking me instead of their government:

Pivot your energy to prosecuting the people responsible for killing 100+ innocent people this year instead of shooting the messenger!

[@levelsio @levelsio]

Exceptional too is the reaction by Spain's Transport Minister @oscar_puente_ today

Puente maintains that the Spanish rail network is safe: "There are systems, rules, and protocols in place. Mistakes can happen, but I want to emphasize that our railways are just as safe as those in neighboring countries."

The level of gaslighting by politicians to always maintain their own interests over the wellbeing of their country is why nobody trusts politicians anymore

[Rayan Castilla @rayancasz]

@0xharsh_ @trywindmill @0xharsh_ MVP!! 🔥

[Rayan Castilla @rayancasz]

@rohitnaras @AppliedKinHQ congrats man!! this is acc huge!! 🐐

[Rohit Naras @rohitnaras]

Transformers take 1–3 years to arrive. AI can't wait that long.

@AppliedKinHQ (YC F26) is an AI-native manufacturer: we build transformers, generators, cooling and more to your project's spec, and deliver to site. We are quoting pad-mounts in 7 weeks!

[Nicholas Fabiano, MD @NTFabiano]

Hope is a potent antidepressant.

[Nicholas Fabiano, MD @NTFabiano]

Delusional optimism is extremely underrated for mental health.

[Rayan Castilla @rayancasz]

COLM 2026 was hella fun!

presented our paper at the main conference + 3 workshops and met so many cool people. couldn’t have asked for a better team to do it with.

where do LLM capabilities come from? our paper: https://t.co/q6SeS8eGo9

[Rayan Castilla @rayancasz]

@aaryankushwah this is massively useful!!! congrats on this launch man

[Glenn Matlin @GlennMatlin]

We had a great time today showing off our research results at COLM 2026

If you didn't get a chance to talk with us today, don't worry!! Capabilibara will be appearing at THREE different workshops on Friday. Come meet the team!

(1) Science of Foundation Models
(2) Social Simulations
(3) Actionable Interp

[Rayan Castilla @rayancasz]

@0xharsh_ @rohitnaras @maayanalbert @atharvaalele he’ll know in ~2 weeks

[Clonazepam @Clonazepamers]

Pedro Sánchez tras llevar 8 años en el gobierno sin hacer nada por la vivienda, educación o sanidad viendo cómo echan la culpa a "los fachas".

[Chef José Andrés 🕊️🥘🍳 @chefjoseandres]

Increíble de ver a los “expertos” en solventar la emergencia de vivienda que vive España! En cada televisión! @telediario_tve @A3Noticias @tele5_noticias @noticias_cuatro La realidad es que tenemos a políticos que intentan crear decretos y soluciones cuando no tienen la preparación ni el conocimiento para idear una solución real al problema que vivimos.

España no tiene un problema de falta de decretos. Tiene un problema de falta de viviendas.

Y mientras el Gobierno siga confundiendo anunciar medidas con resolver problemas, seguiremos pagando las consecuencias de su inacción.

Subvencionar la demanda sin aumentar la oferta presiona los precios. Regular cada vez más un mercado sin construir vivienda nueva no elimina la escasez: la administra. Castigar fiscalmente una modalidad de alquiler puede cambiar incentivos, pero tampoco pone un solo ladrillo.

El Gobierno puede aprobar todas las medidas que quiera y venderlas como grandes soluciones. Puede encadenar decretos, anuncios y campañas de propaganda. Pero hay una pregunta que desmonta cualquier discurso:

¿Cuántas viviendas nuevas crea todo esto?

Porque la vivienda no se abarata repartiendo la escasez. Se abarata acabando con ella.

España necesita construir. Mucho.

Más suelo disponible. Licencias en meses, no en años. Más densidad donde sea posible. Seguridad jurídica. Muchísima más vivienda pública y también privada.

Pero el Gobierno no está haciendo lo necesario. Prefiere intervenir sobre las pocas viviendas que existen antes que crear las condiciones para que haya muchas más. Prefiere presentar parches como soluciones y cargar sobre propietarios, promotores y ciudadanos el coste de su fracaso.

Lo demás puede servir para redistribuir, proteger a determinados colectivos o cambiar incentivos. Pero no confundamos eso con solucionar el problema de fondo.

No se arregla una falta de vivienda repartiendo mejor las pocas casas que existen. Se arregla haciendo que existan muchas más.

Menos propaganda. Menos parches. Menos obsesión por intervenir sobre el mismo piso.

Más oferta. Más construcción. Más casas.

[Rayan Castilla @rayancasz]

@0xharsh_ banger

[Dileep Thazhmon @thazhmon]

Excited to announce our $110M raise to scale our stablecoin-native banking platform for global enterprises across 35 countries (10 new countries!) 🚀🦁

Our stablecoin business crossed $1.5B annualized volume in just 8 months, driven by exponential enterprise demand. Since signing the Series C-1 term sheet, revenue has grown more than 50% in a few months. The pace is accelerating.

As we go deeper into the stablecoin ecosystem, I'm pumped to have @coinfund lead the round, joined by @AB_insights, @a16z, @cbventures, @CRV, GIC, @gpt, @paraficapital, Vista, @wmt_ventures, @ycombinator and others.

Also grateful to have the best founders building in the space joining the round: @zcabrams (Bridge, OUSD), @psneville (Circle, Catena), @sternhenri (Privy), @prabhakar2reddy & @karan705 (OpenFX), @SamBroner (Better Money Co.) and Ricardo Marino (Global Chairman at Itaú), among others.

Over the last year, AI & stablecoins have powered us to an inflection point. Today, we have fewer employees than we did two years ago, while revenue and volume have grown more than 10x crossing $5B in annualized TPV. AI is embedded across Jeeves and has fundamentally changed how we build and operate.

Alongside the round, we're launching:

💸 Jeeves stablecoin wallets: Our custom built wallets supporting USDC and USDT, with payouts to 190 countries, all in one platform.

💳 Cards in 10 more countries: Argentina, Peru, Paraguay, Uruguay, Panama, Guatemala and others. The same award winning expense management platform used by BMW, Burger King and H&M are now available in these markets.

🧾 Accounts Receivable (AR): Alongside our core Cards and AP modules, we're launching our AR module, starting with Brazil 🇧🇷 This was one of the biggest customer requests!

📊 Jeeves Global AI Spend Tracker: We all know AI spend is growing but if you operate in six countries, with Claude spend in pesos & OpenAI spend in pounds, how do you actually know what you spent across models, countries, currencies & what drives ROI? Well now you do with our Global AI spend tracker across the globe 🌎

🇪🇸 Lastly, we opened our doors in Madrid to accelerate our expansion across EMEA, with a focus on stablecoin payment corridors between Europe & the world.

The next decade of global banking will be agentic and seamless between stablecoin and fiat. To build this companies need to own the primitives directly. This chapter is being written right now, and small teams with big ambition, powered by AI and stablecoins, will write it. We intend to be the company that defines it 🌎

Thank you to our customers, teammates and investors for the trust you put in us every day 🙏

If you want to shape the future of global money at the cutting edge of stablecoins and AI, come build it with us. It won't be easy but it will be fun 👉 https://t.co/ylDYGqlszL

Day one of this next chapter starts now. It's time to build.

[sui @birdabo]

AHAHAHAHAHAHAHAHAHAHAHA NO WAY.

> OpenAI just announced Dots.
> SpaceXAI bought https://t.co/WdFqpl07IQ

it redirects straight to the Grok Bot download page. based lmao.