Data Scientist / AI Engineer Ajouter aux favoris

Paris
About lemlist

lemlist is the AI-powered sales engagement platform helping sales teams build pipeline smarter, not harder.

Bootstrapped from day one, we've grown from 0 to $50M+ ARR in 8 years without raising a single dollar. Today, 40,000+ sales teams use lemlist to book more meetings and close more deals.

We're building the next generation of outbound: AI-first, multi-channel, highly personalized, and deeply integrated into the way modern sales teams work.

And we're just getting started.

We're looking for a Data Scientist / AI Engineer to join our team. You'll be responsible for identifying and shipping AI use cases that have a direct impact on the product and the business, working closely with Product and Engineering teams.

Your main mission will be:
  • Identify where AI can create leverage across the product, propose concrete use cases, and take ownership from problem framing to production.
  • Design, develop, and maintain LLM-based systems: prompt engineering, orchestration, retrieval pipelines, evaluation frameworks, observability...
  • Deploy and operate AI models and infrastructure, including GPU server management and model serving.
  • Design, train, evaluate, and maintain Machine Learning models in production.
  • Support business and product teams with data-driven insights.
Key Results

Within 3 months, you will have/be:
  • Successfully onboarded and integrated into the team.
  • Have a clear understanding of the product, data, and existing AI systems.
  • Audited existing LLM systems and ML models, identified quick wins and gaps.
  • Shipped a first AI use case end-to-end in production.
  • Set up or improved evaluation frameworks for at least one existing LLM system.
Within 12 months, you will have:
  • Shipped several meaningful AI use cases that have a measurable impact on the product.
  • Built a solid evaluation and observability layer across multiple LLM systems in production.
  • Improved significantly the AI culture within lemlist.
  • Supported the C-level (CEO, CPO, CMO, Head of Sales...) for strategic decisions.
What's in it for you?
  • Work in a profitable, bootstrapped, and high-growth company that doesn't rely on external funding to live.
  • Work on high-impact projects with highly skilled data profiles composed of a Senior Analytics Eng, a Senior Data Engineer and a Data Analyst that directly drive business decisions
  • Collaborate directly with the C-suite on strategic topics
  • Work with a team obsessed with speed, growth, and impact.
Preferred experience

Must have:
  • 4+ years in a Data Science or AI Engineering role, ideally in a fast-moving environment.
  • Advanced Python and SQL skills.
  • Strong hands-on experience building and operating LLM-based systems: model APIs, agentic pipelines, RAGs, evaluation, and observability.
  • Proficiency with agent-based frameworks such as LangChain.
  • Hands-on experience with deep learning libraries (PyTorch, Transformers) and embeddings (SentenceTransformers).
  • Experience deploying and managing models on cloud infrastructure (ideally GCP suite).
  • Familiarity with CI/CD tools (Docker, Jenkins or equivalent).
  • Strong interest in getting things into production.
  • Strong analytical and problem-solving mindset.
  • Fast learner, high ownership, structure, and execution speed.
  • Fluent in French and English.
  • Paris based (Paris office / remote).
Nice to have:
  • Experience with workflow orchestration tools (Airflow or equivalent).
  • Experience managing GPU servers for model training and serving.
  • You have a first experience in B2B SaaS startup
  • Knowledge of general IT good practices - maintainable and commented code, GitHub...
Additional information
  • Competitive salary and company bonus (up to 18K€ per year depending on company's performance)
  • 38 days of holidays/year
  • Alan Blue: Comprehensive 100% premium medical coverage for you and your family
  • Swile Meal Tickets: Enjoy daily meal tickets to fuel productivity
  • Navigo Card: Seamless commuting with a 100% covered Navigo card
  • Gear: Get the laptop, tools, and equipment you need for your job
  • Team building: We all meet once per year at really cool places around the world (check our video here)
Recruitment process
  1. 1st call with Victoire our TAM & Ahmed our AI Engineer
  2. Live technical interview with Ahmed & Eliott - Lead data
  3. Interview with Charles, CEO
  4. Reference Check & Offer
Publié le 2026-05-08

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