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Mistral AI
Mistral AI

Leading company in the artificial intelligence industry

Machine Learning Engineer, Open-Source Software - Paris/London

RoleMachine Learning
LevelMid Level
LocationParis, France
WorkOn-site
TypeFull-time
Posted2 months ago
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Required skills

Python

PyTorch

Machine Learning

MLOps

About Mistral

At Mistral AI, we believe in the power of AI to simplify tasks, save time, and enhance learning and creativity. Our technology is designed to integrate seamlessly into daily working life.

We democratize AI through high-performance, optimized, open-source and cutting-edge models, products and solutions. Our comprehensive AI platform is designed to meet enterprise needs, whether on-premises or in cloud environments. Our offerings include le Chat, the AI assistant for life and work.

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 France, USA, UK, Germany and Singapore. We are creative, low-ego and team-spirited.

Join us to be part of a pioneering company shaping the future of AI. Together, we can make a meaningful impact. See more about our culture on https://mistral.ai/careers.

Role Summary:

You will be in charge of open-sourcing state-of-the-art models, whilst maintaining and improving Mistral’s publicly available libraries. Your work is critical in helping turn research breakthroughs into tangible solutions and improve Mistral's open-source ecosystem.

About the Open Source Software team:

Our OSS team is embedded in our Science team and works very closely with various engineering and marketing teams. All OSS team members can fluidly move on the production / research spectrum depending on where the needs are or where their interests lie

What you will do

  • Releasing our models to open-source platforms and libraries, e.g., vLLM, GitHub, Hugging Face
  • Maintaining Mistral’s open-source libraries (mistral-common, mistral-finetune, mistral-inference)
  • Create and maintain tooling and services: both internal facing (internal research) and external facing (open-source libraries)
  • Implement and optimize open-source and internal libraries for performance and accuracy, ensuring production readiness and employing cutting-edge technology and innovative approaches
  • Collaborate with the open-source community (Py Torch, vLLM, Hugging Face)

About you

  • Master’s degree in Computer Science, Machine Learning, Data Science, or a related field
  • Experience contributing to popular open-source libraries such as Py Torch, Tensorflow, JAX, vLLM, Transformers, Llama.cpp, ...
  • Passion for contributing to the open-source software ecosystem
  • Expert programming skills in Python, Py Torch, MLOps
  • Adaptable, proactive, and autonomous
  • Attention to detail and a drive to go the last mile to build almost perfect tools
  • Deep understanding of machine learning approaches, especially LLMs and algorithms
  • Low-ego, collaborative and have a real team player mindset

Now, it would be ideal if you have:

  • Experience with training and fine-tuning large language models (e.g., distillation, supervised fine-tuning, policy optimization)
  • Experience working with Slurm
  • Worked with research teams before
  • Experience as a core-maintainer of a popular ML open-source library

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About Mistral AI

Mistral AI

Mistral AI

Series B

Mistral AI SAS is a French artificial intelligence (AI) company, headquartered in Paris. Founded in 2023, it has open-weight large language models (LLMs), with both open-source and proprietary AI models. As of 2025 the company has a valuation of more than US$14 billion.

51-200

Employees

Paris

Headquarters

$6.0B

Valuation

Reviews

10 reviews

3.8

10 reviews

Work-life balance

2.8

Compensation

4.0

Culture

4.2

Career

3.5

Management

2.5

72%

Recommend to a friend

Pros

Supportive team and collaborative environment

Good learning opportunities and mentorship programs

Excellent benefits and competitive compensation

Cons

Poor management and lack of leadership direction

Work-life balance issues and heavy workload

High stress environment and burnout

Salary Ranges

36 data points

Mid/L4

Senior/L5

Staff/L6

Mid/L4 · AI SCIENTIST

8 reports

$300,000

total per year

Base

$300,000

Stock

-

Bonus

-

$390,000

$429,000

Interview experience

1 interviews

Difficulty

3.0

/ 5

Duration

21-35 weeks

Interview process

1

Application Review

2

Recruiter Screen

3

Technical Interview

4

Research Discussion

5

Team Matching

6

Offer

Common questions

Machine Learning/AI Concepts

Research Experience

Technical Knowledge

Coding/Algorithm

Behavioral/STAR