Abel Fernández

Cuban living and working in Chile. Software Engineer at @Uber. Mountain Bike enthusiast and Real Madrid fan.

[Abel Fernández @abelfdezh]

I’ve been vibe coding on personal projects lately and testing tools and models. Here are a few conclusions and modest tips if you’re building with AI. 🧵

[Abel Fernández @abelfdezh]

@salanova_ 🙂

[Andrej Karpathy @karpathy]

It is hard to communicate how much programming has changed due to AI in the last 2 months: not gradually and over time in the "progress as usual" way, but specifically this last December. There are a number of asterisks but imo coding agents basically didn’t work before December and basically work since - the models have significantly higher quality, long-term coherence and tenacity and they can power through large and long tasks, well past enough that it is extremely disruptive to the default programming workflow.

Just to give an example, over the weekend I was building a local video analysis dashboard for the cameras of my home so I wrote: “Here is the local IP and username/password of my DGX Spark. Log in, set up ssh keys, set up vLLM, download and bench Qwen3-VL, set up a server endpoint to inference videos, a basic web ui dashboard, test everything, set it up with systemd, record memory notes for yourself and write up a markdown report for me”. The agent went off for ~30 minutes, ran into multiple issues, researched solutions online, resolved them one by one, wrote the code, tested it, debugged it, set up the services, and came back with the report and it was just done. I didn’t touch anything. All of this could easily have been a weekend project just 3 months ago but today it’s something you kick off and forget about for 30 minutes.

As a result, programming is becoming unrecognizable. You’re not typing computer code into an editor like the way things were since computers were invented, that era is over. You're spinning up AI agents, giving them tasks *in English* and managing and reviewing their work in parallel. The biggest prize is in figuring out how you can keep ascending the layers of abstraction to set up long-running orchestrator Claws with all of the right tools, memory and instructions that productively manage multiple parallel Code instances for you. The leverage achievable via top tier "agentic engineering" feels very high right now.

It’s not perfect, it needs high-level direction, judgement, taste, oversight, iteration and hints and ideas. It works a lot better in some scenarios than others (e.g. especially for tasks that are well-specified and where you can verify/test functionality). The key is to build intuition to decompose the task just right to hand off the parts that work and help out around the edges. But imo, this is nowhere near "business as usual" time in software.

[camila @Camila_Cabello]

There is so much going on here at home and so much I can say about the heartbreaking things the immigrant community is experiencing here in the US. I also feel a personal responsibility to speak about what’s happening in Cuba, I still have family on the island that we speak to and send medicine, food and clothes to.

It has been 67 years of a failing dictatorship and an oppressive regime. The Cuban people are suffering in an echo chamber where no one can hear them because to speak is to risk your life. Many people are starving, looking for food in trash heaps, and the only way to survive is having relatives ship you boxes of medicine because not even the hospitals have medicine.

The power is gone for so long that food spoils and water becomes scarce . When people have peacefully protested, they have disappeared or been put behind bars, some as young as 13 years old. This is a reality where a post online costs you your life. The Cuban people have lived without dignity and without hope for too long. It’s no wonder so many Cubans have thrown themselves into shark infested waters, making boats out of tires and sticks and risking their lives for freedom.

They are now in the midst of a profound humanitarian crisis. If you want to help and don’t know how, check the link below to support Caritas Cuba and their work. If you’re able to give, any donation makes a difference.

thank u so much love you guys 🌺💌🇨🇺

#SOSCUBA 🥺

https://t.co/YAmKaTjwpW

[Abel Fernández @abelfdezh]

@IvanDCalas “Ustedes le sirven a un dios muerto, nosotros le servimos a un Dios vivo”

[Abel Fernández @abelfdezh]

@IvanDCalas In hoc signo vinces ✝️

[Mario Díaz-Balart @MarioDB]

Esto es lo que hace la dictadura corrupta, cruel y asesina en Cuba: encarcela a sus propios ciudadanos simplemente por expresar sus opiniones.

¡La libertad de expresión nunca debe ser un delito!

#SOSCuba #El4tico #AbajoElComunismo #AbajoLaDictaduraCastrista

[Embajada de los Estados Unidos en Cuba @USEmbCuba]

Nos unimos al llamado de muchos que se liberen y se respeten los derechos humanos de los jovenes de #El4tico en Holguín - Ernesto Ricardo Medina y Kamil Zayas Pérez #FreeEl4tico

[Abel Fernández @abelfdezh]

@dani91malaga Espera a que veas esto 🙂

[Abel Fernández @abelfdezh]

@Mega Lamentable que compren los derechos de la supercopa para que no sirva la aplicación

[Abel Fernández @abelfdezh]

@Nicon2002 @JoseCarrasco_98 @LaLigaFantasy @biwenger Bloqueo no, embargo comercial 😁

[Abel Fernández @abelfdezh]

@LaLigaFantasy

[Abel Fernández @abelfdezh]

@Rodra10_97 @ESPNDeportes Te voy a perseguir por lo civil y lo penal 🤨

[Abel Fernández @abelfdezh]

@UPFronterizos Estimados; estoy intentando hacer el trámite para salida y entrada de vehículos hacia Argentina y no puedo seleccionar como Punto Fronterizo el Paso Los Libertadores. Hay alguna información al respecto? Gracias de antemano.

[Abel Fernández @abelfdezh]

@agustinverap @investing_chile @fintual 3 años tardó en llegar el feature 🙂

[Abel Fernández @abelfdezh]

@mardonet @paulrmessina Eso si, por este precio yo creo que la Air está bastante bien.

[Abel Fernández @abelfdezh]

@mardonet @paulrmessina La última pro de 14 pulgadas es súper ligera y la batería igual dura muchísimo.

[Abel Fernández @abelfdezh]

Pensaba que este año pasaría sin verla con tanta nieve, pero nos sorprendió para recordarnos que el invierno aún no termina 🙂

[Abel Fernández @abelfdezh]

So far, it’s IMPOSSIBLE to build real, solid software with AI if you don’t know how to build software without it.

[Abel Fernández @abelfdezh]

@tdhalleine Estimado, se encuentra usted absolutamente a otro nivel de fotografía!Mis respetos y mil gracias por esta fotaza y todo lo que hace a diario. Un saludo!