Reference: *****AIILMRE3

Job title: Post-training Specialist (RE3)

About BSC

The Barcelona Supercomputing Center - Centro Nacional de Supercomputación (BSC-CNS) is the leading supercomputing center in Spain.

It houses MareNostrum, one of the most powerful supercomputers in Europe, was a founding and hosting member of the former European HPC infrastructure PRACE (Partnership for Advanced Computing in Europe), and is now hosting entity for EuroHPC JU, the Joint Undertaking that leads large-scale investments and HPC provision in Europe.

The mission of BSC is to research, develop and manage information technologies in order to facilitate scientific progress.

BSC combines HPC service provision and R&D into both computer and computational science (life, earth and engineering sciences) under one roof, and currently has over **** staff from 60 countries.

Look At The BSC Experience

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We are particularly interested for this role in the strengths and lived experiences of women and underrepresented groups to help us avoid perpetuating biases and oversights in science and IT research.

In instances of equal merit, the incorporation of the under-represented sex will be favoured.

We promote Equity, Diversity and Inclusion, fostering an environment where each and every one of us is appreciated for who we are, regardless of our differences.

If you consider that you do not meet all the requirements, we encourage you to continue applying for the job offer.

We value diversity of experiences and skills, and you could bring unique perspectives to our team.

Context And Mission

The Natural Language Processing Research Area at the newly created AI Institute hosted at BSC has consolidated experience in several NLP areas, such as massive language model building, biomedical text mining, and unsupervised learning for under-resourced languages and domains.

It has been entrusted by the Spanish and the Catalan governments with the mission to develop fundamental open-source resources and technologies for Spanish and Catalan.

In connection with this, the Area is currently in charge of two flagship projects at the national and regional level: the ALIA project, funded by the Spanish Secretariat of Digitalization and Artificial Intelligence, and the AINA project, aimed at developing AI resources for Catalan, funded by the Catalan Digitalization Department.

In addition, it takes part in various EU funded international projects.

In this context, the newly created AI Institute is looking for talent to help design and improve its operations and infrastructure.

The Methods and Algorithms for Post-training (MAP) team is looking for engineers with a strong background in Large Language Models, Natural Language Processing and Deep Learning, supported by solid foundations in mathematics and statistics.

The successful candidate will work in a highly sophisticated HPC environment, have access to state-of-the-art systems and computational infrastructures, and establish collaborations with experts in different areas at the regional and international levels.

They will propose, design and implement innovative techniques for language modelling and evaluation in this HPC environment.

Key Duties

Execute and monitor post-training experiments including Instruction Tuning and state-of-the-art Reinforcement Learning techniques (DPO, GRPO and variants and OPD) specifically for Iberian languages.Implement and scale training workflows using frameworks such as Slime, TRL, and NeMo-RL to ensure efficient model adaptation.Develop and curate high-quality datasets in Spanish and other co-official languages including Catalan, Basque and Galician.Perform rigorous evaluation of model performance across regional linguistic nuances to ensure high-quality generation and reasoning.Support the integration of linguistic specificities into the group's general-purpose models by collaborating with the senior engineering team.

Requirements

EducationBachelor's degree in Computer Science, Mathematics, Statistics, Engineering or related field.Master's degree in Artificial Intelligence, Machine Learning, Computer Science, Data Science, Applied Mathematics or a closely related field.Essential Knowledge and Professional ExperienceSolid experience in Fine-tuning and Post-training of Large Language Models.Proficiency in Python and Deep Learning frameworks such as PyTorch.Hands-on experience with modern post-training frameworks like Slime, Verl or NeMo-RL.Familiarity with Natural Language Processing (NLP) tasks and evaluation metrics.Excellent level of English (written and spoken).

Additional Knowledge and Professional ExperienceExperience with advanced Reinforcement Learning methods such as GRPO, OPD and their variants.Knowledge of linguistic features and datasets for Spanish and the co-official languages of Spain.Fluency in Spanish is highly valued.Knowledge of Catalan, Basque or Galician is a significant plus.CompetencesStrong analytical skills for identifying linguistic biases or performance gaps in regional languages.Ability to work effectively in a collaborative and multidisciplinary research environment.Innovative and proactive mindset, with a drive to advance the state of the art in LLM research and contribute to open science.Detail-oriented mindset for data quality and model evaluation.

Conditions

The position will be located at BSC within the Directors DepartmentWe offer a full-time contract (35h/week), a good working environment, a highly stimulating environment with state-of-the-art infrastructure, flexible working hours, extensive training plan, restaurant tickets, private health insurance, support to the relocation proceduresDuration: Open-ended contract due to technical and scientific activities linked to the project and budget durationHolidays: 22 days of holidays + 6 personal days + 24th and 31st of December per our collective agreementSalary: we offer a competitive salary commensurate with the qualifications and experience of the candidate and according to the cost of living in BarcelonaStarting date: 01/12/2026

Applications procedure and process

All applications must be submitted via the BSC website and contain:

A full CV in English including contact detailsA cover/motivation letter with a statement of interest in English, clearly specifying for which specific area and topics the applicant wishes to be considered.

Additionally, two references for further contacts must be included.

Applications without this document will not be considered.

Development of the recruitment process

The selection will be carried out through a competitive examination system ("Concurso-Oposición").

The Recruitment Process Consists Of Two Phases

Curriculum Analysis: Evaluation of previous experience and/or scientific history, degree, training, and other professional information relevant to the position.

• 40 pointsInterview phase: The highest-rated candidates at the curriculum level will be invited to the interview phase, conducted by the corresponding department and Human Resources.
  
  

In this phase, technical competencies, knowledge, skills, and professional experience related to the position, as well as the required personal competencies, will be evaluated.

• 60 points.
  
  

A minimum of 30 points out of 60 must be obtained to be eligible for the position.

The recruitment panel will be composed of at least three people, ensuring at least 25% representation of women.

In accordance with OTM-R principles, a gender-balanced recruitment panel is formed for each vacancy at the beginning of the process.

After reviewing the content of the applications, the panel will begin the interviews, with at least one technical and one administrative interview.

At a minimum, a personality questionnaire as well as a technical exercise will be conducted during the process.

The panel will make a final decision, and all individuals who participated in the interview phase will receive feedback with details on the acceptance or rejection of their profile.

At BSC, we seek continuous improvement in our recruitment processes.

For any suggestions or comments/complaints about our recruitment processes, please contact (******)(#).

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Deadline

The vacancy will remain open until a suitable candidate has been hired.

Applications will be regularly reviewed and potential candidates will be contacted.

OTM-R principles for selection processes

BSC-CNS is committed to the principles of the Code of Conduct for the Recruitment of Researchers of the European Commission and the Open, Transparent and Merit-based Recruitment principles (OTM-R).

This is applied for any potential candidate in all our processes, for example by creating gender-balanced recruitment panels and recognizing career breaks etc.

BSC-CNS is an equal opportunity employer committed to diversity and inclusion.

We are pleased to consider all qualified applicants for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or any other basis protected by applicable state or local law.

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