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AI Agent & Tool-Use Engineer (RE2)

On-site in Barcelona·Full-time·Added today

Still open when we checked on 8 Oct

Overview

Job details

  • Full-time

    Per the ad.

  • A relocation package

    Help with the move, per the ad.

Requirements

  • Have the right to work in Spain

    Barcelona Supercomputing Center doesn't mention sponsorship in the ad.

  • Work in English

    English is required, per the ad.

  • Work on-site in Barcelona

    A relocation package offered.

  • University degree

    “Education Degree in Computer Science, Mathematics or related.” — per the ad.

Benefits

  • Private health insurance

    Per the ad: paid by the employer, or taken through flexible pay.

  • Meal vouchers

    A restaurant card or tickets, per the ad.

Skills

Requirements

What we're looking for

  • Education
    • Degree in Computer Science, Mathematics or related.
  • Essential Knowledge and Professional Experience
    • Solid experience in Fine-tuning and Post-training of Large Language Models.
    • Practical experience with Agentic AI patterns such as ReAct or autonomous tool-use.
    • Proficiency in Python and Deep Learning libraries like PyTorch.
    • Hands-on experience with modern post-training frameworks including TRL, FastChat, or NeMo-RL.
    • Excellent level of written and spoken English.
  • Additional Knowledge and Professional Experience
    • Familiarity with Model Context Protocol (MCP) and API integration for LLMs.
    • Knowledge of advanced preference alignment methods like DPO, GSPO, or CISPO.
    • Experience in developing benchmarking tools for function calling and reasoning.
    • Fluency in Spanish is highly valued.
    • Knowledge of Spain's co-official languages is a significant advantage.
  • Competences
    • Strong technical execution skills with a focus on reproducibility and clean code.
    • Ability to work effectively in a team-oriented research environment.
    • Proactive problem-solving mindset when dealing with complex system integrations.
    • Detail-oriented approach to evaluating model reliability and edge cases.

Pay & benefits

What you'll get

  • The position will be located at BSC within the Directors Department
  • We 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 procedures
  • Duration: Open-ended contract due to technical and scientific activities linked to the project and budget duration
  • Holidays: 22 days of holidays + 6 personal days + 24th and 31st of December per our collective agreement
  • Salary: we offer a competitive salary commensurate with the qualifications and experience of the candidate and according to the cost of living in Barcelona
  • Starting date: ASAP

The role

Reference: 441_26_AII_LM_RE2

Job title: AI Agent & Tool-Use Engineer (RE2)

The Language Modeling Team at the AI Institute hosted at BSC has consolidated experience across several core NLP and AI areas, including massive language model training, fine-tuning, post-training alignment, domain adaptation, AI agent development and unsupervised learning, including low-resource languages. It has been entrusted by the Spanish and Catalan governments with the mission to develop foundational open-source resources and technologies for Spanish, Catalan and other co-official languages. In addition, the team actively participates in various EU-funded international research initiatives. In this context, the AI Institute is looking for talent to help advance its operations, research capabilities and technical infrastructure.
The Language Modeling Team is seeking candidates with a strong background in computational linguistics and hands-on experience in Language Technologies; particularly in deep learning, large language model development, instruction tuning, and agentic workflows, as well as related areas of Natural Language and Speech Processing.
The successful candidate will work in a highly sophisticated HPC environment, access state-of-the-art computational infrastructure, and collaborate with leading experts both locally and internationally. The researcher will be responsible for designing and implementing innovative techniques for language modeling, evaluation and system adaptation tailored to high-performance computing systems.

What you'll do

  • Implement and test agentic workflows including multi-step reasoning and tool-use capabilities under the supervision of the senior architect.
  • Develop and refine Function Calling interfaces and connectors using the Model Context Protocol (MCP) to enhance model interactivity.
  • Execute post-training experiments using TRL, FastChat, and NeMo-RL to improve the agentic performance of small and large models.
  • Build and maintain evaluation pipelines specifically designed to measure the reliability and safety of model-tool interactions.
  • Collaborate with the data team to curate high-quality instruction datasets for task-oriented dialogue and function execution.

Hiring process

3 steps2 interviewsa task to do
  1. Application

  2. Screening · With a recruitment panel

  3. Technical interview

    With department representatives · Video call

    Online interview with the department; may include a technical test.

  4. HR interview

    With HR · Video call

    Online competency and attitude-based interview.

  5. Profile questionnaire

    Online test · 5 min

    A five-minute questionnaire on motivation sent during the interview phase.

  6. Contract proposal · With HR

  • Every interviewed candidate is told the outcome by phone or email.
  • Feedback or appeal requests are answered within two weeks.

Hiring process

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

  • A full CV in English including contact details
  • A 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.

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 points
  • Interview 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 recruitment [at] bsc [dot] es.
For more information, please follow this link.

About Barcelona Supercomputing Center

The Barcelona Supercomputing Center (BSC) is a leading research center in high-performance computing (HPC) and artificial intelligence, located in Barcelona, Spain. It operates the MareNostrum supercomputer, one of the most powerful in Europe, and conducts research across earth sciences, life sciences, computer science, and computational social sciences. BSC is a key player in European HPC initiatives and collaborates with industry and academia worldwide.

BSC's Spain presence is centered in Barcelona, where it employs a diverse, international team of researchers and engineers. The center offers a dynamic, multidisciplinary environment with a strong focus on scientific excellence and innovation. For international professionals, BSC provides opportunities to work on cutting-edge projects in AI, climate modeling, and supercomputing, with English as a common working language and a supportive relocation environment.

Industry
Research and HPC
Founded
2005
Employees
500–1,000
Headquarters
Barcelona, Spain
In Spain
Barcelona
Website
bsc.es

Good to know if you are moving

  • BSC is located in Barcelona, a vibrant Mediterranean city with a high quality of life and a large international community.
  • The working language at BSC is English, making it accessible for international researchers and engineers.
  • BSC offers competitive salaries and benefits, including support for relocation and visa processing for international staff.
  • The center provides opportunities for professional development, including training programs and participation in European research projects.
  • BSC is a non-profit research center, offering a stable and collaborative work environment focused on scientific impact.

In their own words

About the company & team

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 1000 staff from 60 countries.

Look at the BSC experience:
BSC-CNS YouTube Channel
Let's stay connected with BSC Folks!

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.

Additional information

The vacancy will remain open until a suitable candidate has been hired. Applications will be regularly reviewed and potential candidates will be contacted.

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.
For more information follow this link

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