Applied Scientist - Research Engineer (Optimisation), EMEA
Mistral.ai has an opening for an Applied Scientist - Research Engineer (Optimisation), EMEA in Paris, France. It is listed as a full-time position.
DGJ summary of this job
Our own short read of this listing, built only from the facts it gives. The employer’s original text follows further down.
Mistral.ai has an opening for an Applied Scientist - Research Engineer (Optimisation), EMEA in Paris, France. It is listed as a full-time position.
Reading the advert, the employer asks for English language skills.
Skills and tools named in the text include Python, machine learning, PyTorch, LLM, supply chain, logistics and research.
No salary is given in this listing, so check the official pay figures in the DGJ Insight section below where they exist.
Benefits mentioned in the advert: pension or retirement plan, parental leave and relocation support.
The advert does not mention visa sponsorship. If you would move to France for this job, check the official work permit route first (DGJ Insight lists it where we have it).
Dev Global Jobs found this job on Arbeitnow on Nov 5, 2026.
- Employer
- Mistral.ai
- Location
- Paris, France
- Job type
- Full-time
- Pay
- Not stated by the employer
- Languages asked
- English
- Found
- Nov 5, 2026 on Arbeitnow
- Employer text
- 547 words, about 2 min to read
- Apply only on the official page (arbeitnow.fr). Dev Global Jobs is not the employer and never asks for a fee.
- Mirror the skills the advert names (Python, machine learning, PyTorch and LLM) in your CV where you really have them; applicant tracking systems look for these words.
- Say your level in English plainly (for example B2 or C1).
- Read the employer’s full text below (about 2 min) before you apply.
- Build or check your CV with the free DGJ CV Builder.
DGJ Insight
Our own data about this role and place, from official statistics and our live job index.
Source: OECD Average annual wages, 2025
UN living-cost index for Paris (ICSC post adjustment 50.5), as of 1 Oct 2026.
Source: ICSC post adjustment classifications (icsc.un.org)
- Talent Passport: Qualified employees, researchers, artists, investors; multi-year permit
- Employee (salarié) visa: Employer work authorisation from the labour office
- Temporary worker visa: Contracts under 12 months
About the role
Full text from the employer, as published on Arbeitnow, arranged into sections. Nothing added or removed.
01About Mistral
Mistral provides full-stack AI solutions: from frontier models to developer tools, applications, and compute. We partner with enterprises tackling the hardest problems across high-stakes industries like finance, manufacturing, defense, healthcare, and the public sector, co-creating customized AI systems that they can run on their terms.
We are a dynamic, collaborative team passionate about AI and its potential to transform society. Our diverse workforce thrives in competitive environments and is committed to driving innovation. Our teams are distributed between Europe, North America, Asia and the Middle East. We are creative, low-ego and team-spirited.
02The Role
Mistral AI is seeking 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, and apply them to diverse use cases.
Working cross-functionally with both external and internal science, engineering, and product teams you will deliver high-impact AI solutions. We are made of researchers, engineers, product builders, ex-founders who love tackling the most complex real world problems in the industry.
03What you will do
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), and build evaluators and benchmarks for operational research tasks.
Use solvers as verifiers to build reward signals for reinforcement learning.
Develop the necessary 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.
04About you
Fluent in English with excellent communication skills, at ease explaining complex technical concepts to both technical and non-technical audiences.
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 (e.g. Gurobi, CPLEX, OR-Tools) and modelling languages (e.g. Pyomo, AMPL).
Not afraid of contributing to a big codebase; finds their way around independently with little guidance.
Writes clean, readable, high-performance, fault-tolerant Python code.
Doesn’t need roadmaps: moves independently and navigates uncertainty with confidence.
Low-ego, collaborative and eager to learn.
Track record of success through personal projects, professional projects or academia.
05Nice to have
Ex-founder or builder
PhD / Master in a relevant field (Operational Research, Applied Mathematics, Machine Learning), exceptional candidates from other backgrounds welcome.
Experience with reinforcement learning using verifiable rewards.
Experience with LLM-based optimisation modelling (e.g. NL4Opt-style problem formulation).
Industry experience in supply chain, logistics, energy, or scheduling.
Experience working on large code bases or large machine learning models at scale.
Contributions to a large open-source or industry codebase.
Publications in top academic journals or conferences.
Enjoys improving existing code: typing, tests, CI pipelines.
06What We Offer
We offer a comprehensive benefits package designed to support your well-being, growth, and work-life balance. Benefits vary by country and may include healthcare coverage, parental leave, retirement plans, relocation support, wellness programs, meal and transportation allowances, and other location-specific perks.
For the most up-to-date details on benefits available in your location, please refer to our Benefits page.
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