JetBrains is a general software company that creates intelligent tools for software developers and teams. Since 2000, we have built products that help developers work more productively, write higher-quality code, and stay focused on solving real problems.

¿Tiene las siguientes habilidades, experiencia e impulso para tener éxito en este puesto? Descúbralo a continuación.
The JetBrains Research team is looking for a Senior Research Engineer to work on Code World Models: models that learn how software systems behave, change, execute, and interact with developer tools.

In This Role, You Will

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- Design and run pre-training, continued pre-training, and mid-training experiments for code models.
- Build and improve data pipelines for large-scale model training, including filtering, deduplication, mixture design, and dataset quality checks.
- Work with code corpora, repositories, tests, execution traces, and synthetic data.
- Develop evaluations for complex repository-level code reasoning tasks.
- Collaborate with researchers and engineers working on ML for code and AI developer tools.





We’ll be happy to have you on our team if you:

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- Have hands-on experience with model pre-training, continued training, or mid-training.
- Have strong engineering skills in Python and experience with modern ML frameworks.
- Understand large-scale ML training workflows, including data processing, distributed training, checkpointing, evaluation, experiment tracking, and debugging.
- Have experience working with large datasets and care about data quality, contamination, sampling, and reproducibility.
- Have a background in NLP, ML for software engineering, or a similar domain.
- Enjoy working on research problems with high uncertainty and turning ideas into working experiments.

It Would Be a Plus If You

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- Have experience training or adapting models for code generation, code understanding, software agents, program repair, test generation, or repository-level reasoning.
- Have worked with

📌 Senior Research Engineer (Madrid)
🏢 JetBrains
📍 Madrid