Applied Scientist & Optimisation Engineer (EMEA)

Mistral; Paris; Remote; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Healthcare coverage

Parental leave

Relocation support

Wellness programs

Job summary

Mistral AI seeks Applied Scientists and Research Engineers focused on optimisation and operational research. You will post-train SOTA large language models to formulate and solve optimisation problems, applying them to diverse use cases in collaboration with science, engineering and product teams.

We are researchers and builders who enjoy tackling complex real-world problems; join a global, distributed team advancing AI research and deployment.

Qualifications

• Fluent in English with excellent communication skills.
• Expert with PyTorch or JAX.
• Experience training or fine-tuning large language models for reasoning, code, or mathematics.
• Strong background in operational research or mathematical optimisation, with hands-on experience using solvers and modelling languages.
• Not afraid of contributing to a big codebase; independent with minimal guidance.
• Writes clean, readable Python code.
• Able to navigate uncertainty and work without rigid roadmaps.
• Collaborative and eager to learn.

Responsibilities

• Run pre-training, post-training and deploy state-of-the-art models on clusters with thousands of GPUs.
• Generate and curate datasets for optimisation modelling (LP, MILP, constraint programming, scheduling, routing).
• Build evaluators and benchmarks for operational research tasks.
• Use solvers as verifiers to build reward signals for reinforcement learning.
• Develop tools and frameworks to facilitate data generation, model training, evaluation and deployment.
• Collaborate with cross-functional teams to tackle complex use cases.
• Manage research projects and communications with client research teams.

Skills

Fluent in English

PyTorch

JAX

LLM training/fine-tuning

Operational research

Python

Independent / self-driven

Team collaboration

Education

PhD in Operational Research or Applied Mathematics

Master in a relevant field

Tools

Gurobi

CPLEX

OR-Tools

Pyomo

AMPL

Job description

Mistral AI seeks Applied Scientists and Research Engineers focused on optimisation and operational research. You will post-train SOTA large language models to formulate and solve optimisation problems, applying them to diverse use cases in collaboration with science, engineering and product teams.

We are researchers and builders who enjoy tackling complex real-world problems; join a global, distributed team advancing AI research and deployment.