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Lexsi Labs

AI Research Scientist (Paris)

Hybrid

Paris, France

Junior

Full Time

17-12-2025

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Skills

Research Training Machine Learning PyTorch TensorFlow Deep Learning Mathematics

Job Specifications

Lexsi Labs is one of the leading frontier labs focusing on building aligned, interpretable and safe Superintelligence. Most of the work involves on creating new methodologies for efficient alignment, interpretability lead-strategies and tabular foundational model research. Our mission is to create AI tools that empower researchers, engineers, and organizations to unlock AI's full potential while maintaining transparency and safety.

Our team thrives on a shared passion for cutting-edge innovation, collaboration, and a relentless drive for excellence. At Lexsi.ai, everyone contributes hands-on to our mission in a flat organizational structure that values curiosity, initiative, and exceptional performance.

As a research scientist at Lexsi.ai, you will be uniquely positioned in our team to work on very large-scale industry problems and push forward the frontiers of AI technologies. You will become a part of the unique atmosphere where startup culture meets research innovation, with key outcomes of speed and reliability.

Responsibilities

You'll work on advanced problems related to AI explainability, AI safety, and AI alignment.
You'll have flexibility in picking up the specialization areas within ML/DL and problem types that address the above challenges.
Create new techniques around ML Observability & Alignment.
Collaborate with MLEs and SDE to roll out the features and manage their quality until they are fully stable.
Create and maintain technical and product documentation.
Publish papers in open forums like arxiv and present in industry forums like ICLR NeurIPS etc.

Qualifications

Has a solid academic background in concepts of machine learning or deep learning or reinforcement learning.
Master or Ph.D in key engineering topics like computer science or Mathematics is required
Should have published peer-reviewed papers or contributed to opensource tools
Hands-on experience in working with deep learning frameworks like Tensorflow, Pytorch etc
Enjoys working on various DL problems that involve using different types of training data sets - textual, tabular, categorical, images etc
Comfortable deploying code in cloud environments/on-premise environments.
Good fundamentals in MLOps and productionising ML models.
Prior experience on working on ML explainability methods - LRP, SHAPE, LIME, IG, CEM etc.
2+ years of hands-on experience in Deep Learning or Machine Learning.
Hands-on experience in implementing techniques like Transformer models, GANs, Deep Learning, etc.

About the Company

Lexsi Labs is dedicated to building the foundations for Safe Superintelligence — uniting alignment theory, interpretability science, and agentic autonomy into one research continuum to make AI aligned, interpretable and fit for the future. Know more