Independent
AI Consulting

I'm Ruben de la Fuente, an independent AI engineer focused on building reliable, production-ready systems with large language models.

I work with startups and engineering teams to design, implement, and improve AI systems that need to perform consistently outside of demos.

The goal is simple: systems that behave predictably, can be measured, and can be maintained over time.

• Senior AI / ML engineering experience
• Formerly at PayPal, working on production systems at scale
• Experience across data science, backend systems, and infrastructure
• Multilingual — English, Spanish, French, Danish
• Based in Spain, working remotely

Most AI systems don't fail because of the model.

They fail because the surrounding system isn't designed with enough structure.

• No clear evaluation
• Limited behavioral visibility
• Fragile pipelines
• Difficult team handoffs

I focus on making these systems more robust, observable, and maintainable.