Research Engineer - Tokenizer & Protocols
Mistral AI · Paris
Frontier labonsite
At a glance
Highlights
- Own core tokenization formats used across training and production.
- Work across pretraining, post-training and deployment stack.
- Decisions will reach every model Mistral ships.
What they offer
- Healthcare coverage
- Parental leave
- Retirement plans
- Relocation support
- Wellness programs
- Meal and transportation allowances
Ideal candidate
Detail-oriented software engineer who cares about correctness and shared tooling. Collaborative, low-ego builder excited to own foundational libraries used by every model.
Requirements
- Strong software engineering background with excellent Python
- Excellent understanding of tokenizers: BPE and other algorithms, special tokens, chat templates, and tokenizer training
- Hands-on experience with libraries such as tiktoken or Hugging Face tokenizers
- Experience building production-grade libraries used by many people
- Taste for correctness and attention to detail
- Good knowledge of how LLMs are trained and served
- Clear communication, low ego, and collaborative mindset
- remote policy
- Primarily office-based in Paris or London; limited remote in France & UK with monthly office visits
Lab profile
About Mistral AI
Provides full-stack AI solutions from frontier models to tools, applications, and compute.
What they build
- Frontier AI models
- Developer tools
- AI applications
Known for
- Full-stack AI development
- Enterprise co-creation and deployment
- Customizable systems that run on customer terms
- Focus on finance, manufacturing, defense, healthcare and public sector
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