Senior AI Agent & Systems Architect (RE3-T1)

Barcelona Supercomputing Center; Barcelona; On-site; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Restaurant tickets

Private health insurance

Relocation support

Job summary

The Barcelona Supercomputing Center is seeking a Senior AI Agent & Systems Architect to lead multi‑step agentic workflows and integrate MCP and function‑calling into state‑of‑the‑art language models. You will guide experiments in a high‑performance computing environment while mentoring junior researchers and collaborating with infrastructure teams.

Strong track records in LLMs, Python and deep learning are required, with a focus on open‑source contributions and publications in top venues.

Qualifications

• PhD or Master’s degree in Computer Science, Artificial Intelligence or a related field.
• Proven track record in developing LLM-based agents, function calling systems or complex AI pipelines.
• Excellent English communication, both written and spoken.

Responsibilities

• Lead the design and implementation of agentic workflows focusing on multi-step reasoning, tool‑use and autonomous decision‑making.
• Architect the integration of MCP and Function Calling capabilities into language models.
• Supervise robust agent evaluation frameworks for reliability, safety and tool interaction accuracy.
• Collaborate with infrastructure to deploy agentic systems in HPC environments.
• Provide technical leadership and mentor junior researchers, shaping the roadmap for agentic capabilities.
• Contribute to top conferences and Open Source projects in language modeling and agents.

Skills

Python

Deep Learning

PyTorch

JAX

Transformers

Agentic AI

Distributed training

Education

Master's or PhD in CS/AI

Tools

TRL

FastChat

NeMo-RL

slime

Job description

Starting date: ASAP

Job Reference: 440_26_AII_LM_RE3-T1

Position: Senior AI Agent & Systems Architect (RE3-T1)

Closing Date: Thursday, 22 October, 2026

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 1000 staff from 60 countries.

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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 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.

Key Duties

• Lead the design and implementation of agentic workflows focusing on multi-step reasoning, tool‑use and autonomous decision‑making.
• Architect the integration of Model Context Protocol (MCP) and Function Calling capabilities into the group’s core language models.
• Supervise the development of robust agent evaluation frameworks to measure reliability, safety and tool‑interaction accuracy.
• Collaborate with the infrastructure team to ensure scalable deployment of agentic systems in high-performance computing environments.
• Provide technical leadership and mentorship to junior and intermediate researchers by defining the roadmap for the agentic capabilities of the models.
• Contribute to the scientific community through high-quality publications in top‑tier conferences like NeurIPS, ICLR or ACL and Open Source contributions.

Requirements

• Education
  • PhD or Master’s degree in Computer Science, Artificial Intelligence or a related field.
• Essential Knowledge and Professional Experience
  • Proven track record in developing LLM-based agents, function calling systems or complex AI pipelines.
  • Expert knowledge of Python and Deep Learning frameworks like PyTorch or JAX.
  • Deep understanding of Transformer architectures and recent advances in Agentic AI such as MCP, ReAct or AutoGPT-style patterns.
  • Hands‑on experience with modern post‑training frameworks including TRL, FastChat, slime or NeMo-RL.
  • Experience with distributed training and large‑scale model deployment.
  • Excellent level of written and spoken English.
• Additional Knowledge and Professional Experience
  • Strong track record of high‑quality publications in top‑tier conferences like NeurIPS, ICLR or ACL.
  • Significant contributions to Open Source projects in the field of LLMs or agents.
  • Fluency in Spanish is highly valued.
  • Knowledge of Spain’s co‑official languages, such as Catalan, Basque or Galician is a significant advantage.
• Competences
  • Strong leadership and mentorship abilities to guide and support junior researchers.
  • Excellent communication skills for technical and non‑technical audiences.
  • Project management skills with the ability to define and execute research roadmaps.
  • Proactive attitude and ability to work in a high‑performance computing environment.

Conditions

• 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

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.