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Fundamental

ML Researcher

Barcelona

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hirly's read of this role

Seniority
Mid level
Country
ES
Work mode
On-site / unstated
First seen by hirly
28 Sept 2026

Derived automatically from the posting. Upload your resume above to see how the role scores against it.

the posting

About Fundamental

Fundamental is an AI research lab pioneering the future of enterprise decision-making. Our flagship model, NEXUS is the world's most powerful Large Tabular Model (LTM) - purpose-built for the structured records that contain trillions of dollars in business value. With $275m in funding from leading investors and trusted by Fortune 100 companies, Fundamental is giving businesses the Power to Predict.

At Fundamental, you'll work on unprecedented technical challenges in foundation model development and build technology that transforms how the world's largest companies make decisions. This is your opportunity to be part of a category-defining company from the ground-up. Join the team defining the future of enterprise AI.

Key responsibilities

As part of the Research team, you will contribute to ideation, designing, implementing, and evaluating breakthrough Machine Learning models that will be deployed in the real world. Your work will be focused on the entire lifecycle of the models. Alongside the rest of the ML researchers in the team, you will be responsible for our models’ performance in every meaning of this word - whether this means achieving high evaluation scores through novel architectures and training methods, establishing the evaluation protocols themselves, or implementing methods that allow for efficient training and inference. The greatest research is done through solid engineering, so alongside the research you will also take part in ensuring that our research code allows swift, rapid development and testing of new ideas - both your own and the rest of the team’s.

Must have

Strong familiarity with the full research cycle in Machine Learning

Strong fundamentals of software engineering

Strong knowledge of Python, and its ML frameworks

Experience with:

Full lifecycle of AI model development

ML infrastructure frameworks and tools

Developing new ML methods, algorithms and models

GPUs (or TPUs) and distributed training

Scaling up models and training regimes

Knowledge of:

Classical ML methods and algorithms

Deep Learning techniques

Nice to have

Expertise within one of the following areas is a strong bonus: Architecture Research, Distillation (Model Compression), Evaluation, Code Generation, LLMs

Experience with foundational models, e.g. LLMs

Published research at AI conferences

Contributions to open source ML projects

Experience working with tabular data / predictive analytics

High Kaggle rank

BSc/MSc/PhD in computer science/machine learning

Benefits

Competitive compensation with salary and equity

Comprehensive health coverage for you and your dependents

Paid parental leave for all new parents, inclusive of adoptive and surrogate journeys

Relocation support for employees moving to join the team in one of our office locations

A mission-driven, low-ego culture that values diversity of thought, ownership, and bias toward action

Original posting on Fundamental's site ↗

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