ML Researcher

Fundamental; Barcelona; On-site; EUR 100,000 - 160,000; Full time

Benefits offered by this job

Salary + equity

Health coverage

Parental leave

Relocation support

Growth culture

Job summary

Fundamental is an AI research lab in Barcelona advancing enterprise decision-making. As part of the Research team, you will ideate, design, implement, and evaluate breakthrough ML models powering Nexus, our flagship Large Tabular Model.

You’ll own stages of the model lifecycle—from data handling and training to evaluation and deployment—working alongside software engineers to ensure scalable, maintainable code. The role includes competitive compensation, equity, and relocation support.

Qualifications

• Strong familiarity with the full ML research cycle.
• Strong fundamentals of software engineering.
• Proficient in Python and ML frameworks.
• Experience with ML infrastructure and distributed training.
• Expertise in tabular or structured data models.

Responsibilities

• Design and implement ML models for enterprise use.
• Evaluate models and establish evaluation protocols.
• Ensure scalable training and efficient inference.
• Collaborate with ML researchers and engineers.

Skills

ML Research

Python

ML frameworks

Distributed training

GPUs/TPUs

Software engineering

Education

PhD in CS/ML

MS/BS with strong research

Tools

PyTorch

TensorFlow

Keras

Job description

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.

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
• Expertise in at least one of the following:
• Tabular models, time series models, relational foundation models, structured data, large-scale foundation models

Nice to have

• 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