This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Research Engineer (Reinforcement Learning) based in Spain.
Join a small, senior engineering team building the next generation of voice- and text-driven AI agents.
You’ll focus on post-training models to make agents more capable, reliable, and effective over long-running interactions.
Your work will span environments, verifiers, synthetic data, training experiments, evaluations, and production deployment.
You’ll tackle challenging problems such as persistent context, reliable tool use, and multi-turn agent behavior.
The role combines hands-on research and engineering, with a strong emphasis on measurable improvements in model performance.
You’ll work closely with experienced engineers in a remote, collaborative environment where technical craft and creativity are highly valued.
Your contributions will directly shape AI systems operating at significant production scale.
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Accountabilities
Build training environments, verifiers,



and supporting infrastructure for post-training models.
Own the synthetic data pipeline from data generation through quality assurance and validation.
Run end-to-end training experiments, analyze results, and clearly identify the factors driving model improvements.
Design and maintain evaluations that models must pass before production releases.
Select and adapt suitable open-weight foundation models for specific agent and product requirements.
Develop trained behaviors that perform consistently across both voice and text-based agents.
Deploy trained models to production and continuously improve them based on real-world usage and feedback.
Develop robust approaches to long-horizon interactions, accumulated context, and reliable tool use during live conversations.
Requirements:
Strong Python engineering skills and the ability to build reliable, production-quality systems.
Demonstrated experience taking a machine lea

📌 Research Engineer (España)
🏢 Jobgether
📍 España