AI Engineer / LLM / Agents - Freelance (M/F)

France | Nov. 5, 2026

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Company: Collective.work

Country: France

Type: Onsite

Employment: Full-time

Description: Daily rate (TJM): €620/dayCONTEXTRecruitment for a major player in public financing and business support, based in Maison-Alfort. The technical team works on innovative projects around artificial intelligence, in particular the development of chatbots and AI agents integrated into internal information systems. MISSIONS *    Development of internal (e.g. Jarvis) and external (business assistants) chatbots. *    Creation of AI agents capable of executing workflows, interacting with APIs, orchestrating tools and automating complex tasks. *    Advanced integration of LLM models: Mistral, GPT, Claude, etc. *    Technical contribution to cross-functional platforms: IALAB, IAP, GED/PHX, RPA, etc. *    Participation in system demonstrations on the topics of chatbots, automated workflows, IALAB. *    Design or improvement of business chatbots. * Developing AI assistants to manage documentation, workflows, document qualification, etc. *    Implementation of key mechanisms: memory, information retrieval, contextualization. *    UX optimization of interactions: prompts, actions, structured responses. *    Multi-model support: Mistral Large, GPT-4o, Claude 3.7, etc. *    Integration and orchestration with the internal information system. *    Secure calls to internal APIs: ERP, EDM, RPA, CRM, PHX, etc. *    Connection to existing orchestration tools: RPA, IALAB, document pipelines. * Establishment of tool executors with detailed management of authorizations and logs. *    Industrialization and reliability of solutions. *    Complete observability: logs, metrics, traceability, cost monitoring. *    Unit and end-to-end testing for chatbots and agents. *    Contribution to internal frameworks: in-house libraries, AI conventions. *    Participation in system demonstrations, PI planning and Agile increments. TOOLS & ENVIRONMENT *    Languages ​​and frameworks: Python (FastAPI, async), Node.js/TypeScript, agent frameworks (LangChain, LlamaIndex, CrewAI, Semantic Kernel). *    Models and AI: LLM (Mistral, GPT, Claude), RAG (Retrieval-Augmented Generation), memory and contextualization. *    Integration and orchestration: REST API, GraphQL, internal tools (ERP, EDM, RPA, CRM, PHX, IALAB, IAP), business connectors. *    Cloud and DevOps: Kafka, Azure Functions, containers, CI/CD. *    Observability and security: Grafana, Prometheus, Langfuse, SSI, DPO, IA governance. WORKING CONDITIONS *    Location: Maison-Alfort (2 days per week + teleworking). *    Experience required: more than 5 years on similar missions. *    Maximum daily rate: €520 depending on experience. 1.  Strong autonomy and ability to lead cross-functional topics 2.  Pedagogy and popularization for professions using chatbots/agents 3.  Ability to document: guides, API docs, diagrams 4.  Product spirit: propose, challenge, prioritize, demonstrate 5.  Active participation in Agile rituals and demonstrations 6.  Expert Python: FastAPI, async, modular architectures 7.  Very good foundations in Node.js/TypeScript for certain front agents or integration services 8.  API-first oriented development 9.  Good practice of cloud architecture patterns: Azure Functions, containers, CI/CD 10. DevSecOps: You Build It And You Run It 11. Mastery of the design of tooled AI agents (ReAct, Agentic Workflow, Toolformer-like) 12. Knowledge of agent frameworks: LangChain, LlamaIndex, CrewAI, Semantic Kernel or equivalents 13. Strong ability to model AI/business workflows in complex environments 14. Excellent mastery of LLM (Mistral, GPT, Claude) 15. Design of complex conversational flows 16. Integration of memory modules, RAG, reformulation 17. Optimization

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