Senior AI Engineer

Posted about 1 month agoViewed
FranceFull-TimeSoftware Development
Company:lemlist
Location:France
Languages:English
Seniority level:Senior, Real experience
Experience:Real experience
Skills:
LeadershipNode.jsPythonArtificial IntelligenceDesign PatternsMachine LearningTypeScriptData scienceDevOpsSoftware Engineering
Requirements:
Strong software engineering background (Node, Typescript, Python) Real experience building industrialised AI features in production Solid knowledge of Agentic systems Solid knowledge of Context / state machine logic Solid knowledge of Retrieval-Augmented Generation architecture Solid knowledge of LLM evaluation and monitoring Ability to own technical direction end-to-end Leadership and communication skills Strong problem-solving and critical-thinking skills Passion for building 'real' AI systems used by thousands of users Passion for continuous learning and staying updated with the latest AI trends Experience with LangChain / LangGraph / custom agent frameworks (Nice to have) Experience with LLM evaluation frameworks (ex: Trulens, DeepEval, Opik…) (Nice to have) Experience in SaaS (Nice to have) Experience mentoring engineers (Nice to have) Open source contribution (Nice to have) Ability to explain complex AI concepts to non-technical stakeholders (Nice to have)
Responsibilities:
Design and implement agentic architecture (LangGraph, Mastra, custom JS framework) Define context management, memory, data flow, and action orchestration Build safe, deterministic, observable multi-step agents Build AI variables capable of autonomous action loops Deliver AI Copilot v1 (semi-agentic, with possibility to extend to autonomous workflows) Build evaluation pipelines (llm eval, regression tests, drift detection) Implement 360 monitoring of all output (latency, cost, quality, hallucinations) Conduct error analysis and improve models to address bias, fairness, and explainability Document technical processes and results Optimize for performance, reliability, and cost Mentor the team on AI engineering best practices Own technical decisions for AI
About the Company
lemlist
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