Overview
Machine Learning Engineer (Mid / Senior) (LLM) — Relocation Offered
Location : San Sebastian, Spain. Company : Multiverse Computing. Relocation package and related benefits are provided.
About Multiverse Computing
Multiverse is a well-funded, fast-growing deep-tech company founded in 2019. We are the largest quantum software company in the EU and have been recognized by CB Insights (2023 and 2025) as one of the 100 most promising AI companies in the world.
With 180+ employees and growing, our team is fully multicultural and international. We deliver hyper-efficient software for companies seeking a competitive edge through quantum computing and artificial intelligence.
Our flagship products, CompactifAI and Singularity, address critical needs across various industries :
Products
- CompactifAI is a groundbreaking compression tool for foundational AI models based on Tensor Networks. It enables the compression of large AI systems—such as language models—to make them significantly more efficient and portable.
- Singularity is a quantum- and quantum-inspired optimization platform used by blue-chip companies to solve complex problems in finance, energy, manufacturing, and beyond. It integrates seamlessly with existing systems and delivers immediate performance gains on classical and quantum hardware.
You’ll be working alongside world-leading experts to develop solutions that tackle real-world challenges. We’re looking for passionate individuals eager to grow in an ethics-driven environment that values sustainability and diversity.
We’re committed to building a truly inclusive culture—come and join us.
Responsibilities
Design and develop new techniques to compress Large Language Models based on quantum-inspired technologies to solve challenging use cases in various domainsConduct rigorous evaluations and benchmarks of model performance, identifying areas for improvement, and fine-tuning and optimising LLMs for enhanced accuracy, robustness, and efficiencyBuild LLM-based applications such as RAG and AI agentsUse your expertise to assess the strengths and weaknesses of models, propose enhancements, and develop novel solutions to improve performance and efficiencyAct as a domain expert in the field of LLMs, understanding domain-specific problems and identifying opportunities for quantum AI-driven innovationMaintain comprehensive documentation of LLM development processes, experiments, and resultsShare your knowledge and expertise with the team to foster a culture of continuous learning, guiding junior members of the team in their technical growth and helping them develop their skills in LLM developmentParticipate in code reviews and provide constructive feedback to team membersStay up to date with the latest advancements and emerging trends in LLMs and recommend new tools and technologies as appropriateRequired Minimum Qualifications
Bachelor's, Master's or Ph.D. in Artificial Intelligence, Computer Science, Data Science, or related fields.Mid : 2+ years of hands-on experience with deep learning models and neural networks, preferably working with Large Language models and TransformerSenior : 5+ years of hands-on experience with deep learning models and neural networks, preferably working with Large Language models and Transformer architectures, or computer vision models2+ years of hands-on experience using LLM and Transformer models, with excellent command of libraries such as HuggingFace Transformers, Accelerate, Datasets, etc.Solid mathematical foundations and expertise in deep learning algorithms and neural networks, both training and inferenceExcellent problem-solving, debugging, performance analysis, test design, and documentation skillsStrong understanding with the fundamentals of GPU architectures and LLM hardware / software infrastructuresExcellent programming skills in Python and experience with relevant libraries (PyTorch, HuggingFace, etc.)Experience with cloud platforms (ideally AWS), containerization technologies (Docker) and with deploying AI solutions in a cloud environmentExcellent written and verbal communication skills, with the ability to work collaboratively in a fast-paced team environment and communicate complex ideas effectivelyPrevious research publications in deep learning or any tech field is a plusFluent in EnglishWork location : San Sebastian (relocation required)Preferred Qualifications
Spanish language skillsExperience running large-scale workloads in high-performance computing (HPC) clustersExperience in DevOps / MLOps practices in deep learning product developmentExperience in handling large datasets and ensuring data qualityExperience with inference and deployment environments (TensorRT, vLLM, etc.)Experience in the accuracy evaluation of LLMs (OpenLLM Leaderboard)Experience building and evaluating RAG systemsFamiliarity with AI ethics and responsible AI practicesWhat we offer
Indefinite contractEqual pay guaranteedVariable performance bonusSigning bonusWe offer work visa sponsorship (If applicable)Relocation package (if applicable)Private health insuranceEligibility for educational budget according to internal policyHybrid opportunityFlexible working hoursLanguage classes and discounted lunch optionsWorking in a high-paced environment, working on cutting-edge technologiesCareer plan. Opportunity to learn and teachProgressive company. Happy people cultureAdditional details
As an equal opportunity employer, Multiverse Computing is committed to building an inclusive workplace. The company welcomes people from all different backgrounds, including age, citizenship, ethnic and racial origins, gender identities, individuals with disabilities, marital status, religions and ideologies, and sexual orientations to apply.
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