{"id":4155948,"url":"https://alion.io/job/mistral-ai-research-engineer-tokenizer-protocols","title":"Research Engineer - Tokenizer & Protocols","company":{"id":22,"name":"Mistral AI","domain":"mistral.ai","url":"https://alion.io/company/mistral-ai","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":95,"open_postings":183,"ghost_share":0,"stale_share":0.011,"repost_share":0,"time_to_fill_p50_days":65,"computed_at":"2026-11-12T10:38:37Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":null,"employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Paris, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":true,"has_equity":false,"technologies":[{"name":"Hugging Face","optional":false},{"name":"Post-training","optional":false},{"name":"Python","optional":false},{"name":"Tokenization","optional":false}],"status":"live","first_seen_at":"2026-11-12T09:12:25Z","employer_posted_date":"2026-11-12","last_verified_at":"2026-11-12T10:40:36Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"About Mistral\nMistral 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.\nWe 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.\nAbout the role\nBetween a conversation and a model sit the formats and tokenizers that every part of our stack relies on. You will help own them, and the tooling around them, so that training, evaluation and production all speak exactly the same language.\nYou will work across the entire stack, spanning pretraining, post-training and deployment, and your decisions will reach every model we ship.\nWhat you will do\nDesign, build and maintain core libraries for tokenization and model interfaces.\n\nEvolve our formats and tokenizers as models and use cases change.\n\nTurn research needs into robust, shared tooling.\n\nWhat we're looking for\nStrong software engineering background, with excellent Python.\n\nExcellent understanding of tokenizers: BPE and other tokenization algorithms, special tokens, chat templates, and tokenizer training; ideally hands-on experience with libraries such as tiktoken or Hugging Face tokenizers.\n\nExperience building production-grade libraries used by many people.\n\nA taste for correctness and attention to detail.\n\nGood knowledge of how LLMs are trained and served.\n\nClear communication, low ego, and a collaborative mindset.\n\nNice to have\n\nOpen-source maintenance experience.\n\nExperience with inference engines.\n\nLocation and remote\nThis role is primarily based at one of our European offices (Paris and London). 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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.\nFor the most up-to-date details on benefits available in your location, please refer to our Benefits page.\nPrivacy Policy\nYour privacy matters to us. 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