Hi, I'm Guillermo, CTO and co-founder of Uptail. We're on a mission to make every customer feel VIP by building the best AI agents for B2C sales. Our AI agents qualify leads, schedule calls and engage prospects on WhatsApp and voice turning leads into high-intent opportunities.

Our AI agents are already handling 30,000+ conversations per month for large customers like Glovo and Impress and we are backed by leading European investors. This is a unique opportunity to join early and shape the company from day 1.

We're looking for a Senior Product Engineer who can own significant chunks of the product and raise our engineering bar.

What you'll own:

• Design and ship core product features across the full stack from data model to UI
• Build and evolve our agent orchestration layer, LLM pipelines, and evaluation systems
• Make architectural decisions that keep us moving fast as we scale
• Work directly with the founding team and customers to shape product direction
• Mentor early-career engineers

You're the right fit if:

• You have deep full-stack experience: TypeScript, Node.js, Svelte and strong product instinct
• You've built serious AI/LLM-powered applications and know the edge cases that matter
• You treat AI coding tools as a multiplier on your output and you're always pushing that frontier
• You think about systems holistically: scalability, reliability, developer experience
• You want to be close to the decisions, not downstream of them

How we work:

• Take ownership. If it's yours, you own the outcome, no waiting for permission.
• Focus on impact. We work on what truly moves the needle, not busy work.
• Data over opinion. We use evidence to guide decisions.
• Think big. We set ambitious goals and push beyond what feels comfortable.

📩 Reach out directly or apply below.