Freelancer profile translated to English.
Back to original languageAbout Sébastien
Freelance Engineer – AI Agent and LLM Architecture Developer
LangChain / LangGraph / ChromaDB
About Me
Software developer with over 10 years of experience, I now specialize in the design and development of AI agents and LLM-based systems. I help companies create useful, robust AI solutions designed for real-world production use.
My expertise covers the implementation of intelligent workflows with LangChain and LangGraph, as well as the integration of vector databases (ChromaDB) for use cases such as RAG, business assistants, and process automation.
What I Offer
• Design and development of AI agents capable of orchestrating complex tasks and interacting with APIs and business tools
• Implementation of RAG architectures: data ingestion, embeddings, semantic search, and contextualized retrieval
• Solutions designed for production: performance, LLM costs, monitoring, error management, and scalability
• Integration of AI agents into complete applications (APIs, internal tools, web interfaces)
• Structured, testable, and maintainable code, facilitating evolution and handover
• Work in agile methodologies with clear and continuous communication
Do you have an AI agent, RAG, or LLM-based automation project?
Contact me to discuss and build a solution tailored to your challenges.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- OrangeSoftware EngineerTELECOMMUNICATIONSJanuary 2024 - Today (2 years and 5 months)Pessac, FranceSoftware engineer specializing in the development of conversational agents for LLM-based assistance bots. I design and implement conversational AI solutions using LangChain and LangGraph, from the functional scoping phase to production deployment.I work closely with business teams to understand needs, model conversational flows, and ensure relevant, reliable responses aligned with operational objectives.I also contribute to the industrialization of solutions: deployment on GCP, setting up monitoring and metrics tracking via Prometheus and Grafana, fine-grained evaluation of agent execution with tools like Langfuse, managing performance and response quality, as well as optimizing LLM costs within a FinOps approach.My role covers the entire lifecycle of assistance bots, with a strong focus on the robustness, performance, observability, and scalability of the systems.
- OrangeFull Stack DeveloperJuly 2019 - December 2023 (4 years and 5 months)33600 Pessac, FranceAs Full Stack developer in an online store project, my role is to design, develop and maintain frontend ( Vue.JS / TypeScript ) and backend ( Spring Boot / Kotlin ) part of the application. I also work closely with the design team to ensure that the app is user-friendly and user experience is optimal.
- OrangeiOS Software DeveloperDecember 2010 - June 2019 (8 years and 6 months)• Designing architecture and development of iOS App with agile methodology.• Implementation of Unit test.• App performance profiling.• Carrying out technical intelligence. Extra :• Attended to San Francisco Apple WWDC 2013,2014,2017
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Education
- Master 2, Computer Science, specialization in Systems & NetworksUniversity of Bordeaux2010Master 2, Informatique spécialité System & Réseaux
- IT Bachelor's Degree, Computer ScienceUniversity of Montreal2008Licence IT, Informatique