Full-time

Senior Fullstack Developer - AI Applications

Posted by Alstech • June 06, 2026

📍 vitoria gasteiz, araba / álava, Spain
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Description

About the Opportunity

We're partnering with a stealth AI company building infrastructure that powers reinforcement learning (RL) environments for some of the world's leading AI labs.

Their systems operate directly within the AI training loop, helping evaluate, improve, and deploy next-generation AI models. This is highly applied, production-focused engineering work with real-world impact.

We're looking for exceptional Full-Stack Software Engineers who thrive in fast-paced environments, take ownership, and can independently ship complete applications from idea to deployment.


What You'll Do
  • Build full-stack applications end-to-end (frontend, backend, and infrastructure)
  • Transform loosely defined concepts into production-ready products
  • Design and implement systems supporting AI agents and RL workflows
  • Deliver high-quality software rapidly without sacrificing maintainability
  • Collaborate directly with founders, resear...

Ready to Seal the Deal?

Submit your application today and take the next step in your career with Alstech.

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