About Seqera

Seqera is on a mission to empower scientists and organizations to solve humanity’s biggest challenges through data-driven science. As the company behind Nextflow and the Seqera Platform, we enable integral enterprises, biotech innovators, academic institutions, and public sector organizations to scale complex data workflows with confidence.

About the role

We are hiring a Research Engineer to own the improvement loop for a research engine we are building on top of the Seqera Platform. You will build the data and evaluation flywheel from engine’ own run data, and use it to post-train small, task‑specific models that make it better at generating, ranking and running scientific ideas. You will work directly with our Founding Scientist and the engineers who own the application, on a small team that moves fast and ships to real scientists. This is an in‑office role in Barcelona. The team is here, the whiteboards are here, and this is the kind of work that goes faster in the same room.

What You’ll Do




- Design and build the evaluation suite that defines what “better” means for an autonomous research agent.
- Build the pipeline that turns messy, real‑world run data from deployments into a training‑ready corpus.
- Post‑train small open‑weight models — SFT, preference tuning, adapters — to beat frontier‑API baselines on core tasks at lower cost and latency.
- Run repeated training cycles on evolving data.
- Participate in journal clubs, stay at the frontier of post‑training specialized models.
- Own the Next‑Gen roadmap with our Founding Scientist: what data unlocks what capability, and in what order.

About you
- You have post‑trained open‑weight language models — SFT and at least one preference‑tuning method — and put the results in front of real users, not just in a notebook.
- You have retrained models on changing data more than once and have dealt with regression and forgetting in practice: replay, data mixing, adapter strategies, eval gating.
- You have bu

📌 Machine Learning Research Engineer (Barcelona)
🏢 Seqera
📍 Barcelona