Python Engineer - LangGraph & AI Agents

Belmont Lavan Ltd, Francescas, France

What our tracking knows about this posting

Published on 15 September 2026 · first appeared in our records on 16 September 2026.

Stable posting: first seen on 16 September 2026, with no abnormal reposting.

This posting shows no salary, while 9% of open postings in the same sector in this country (France) do.

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We are looking for a Python Engineer with hands-on LangGraph experience to build and deploy production-grade AI agents and agentic workflows. You will combine strong Python software engineering with modern LLM technologies to develop AI systems that can execute multi-step tasks, interact with business systems, use external tools, retrieve information, and operate reliably in production environments. This is a hands-on engineering role for someone who enjoys solving complex software problems and has experience taking AI/LLM solutions beyond prototypes into production. Python & AI Agent Development • Design, develop, test, and maintain AI agent applications using Python and LangGraph . • Build stateful, multi-step agent workflows with branching, looping, retries, and error handling. • Implement tool calling and integrations that allow agents to interact with APIs, databases, and enterprise systems. • Develop reusable components and frameworks for agentic applications. • Integrate LLMs into robust software applications rather than treating them as standalone chat interfaces. LangGraph Engineering • Build and maintain LangGraph-based workflows and agents . • Implement state management, persistence, checkpoints, and workflow recovery. • Develop human-in-the-loop workflows and approval mechanisms. • Design appropriate single-agent and multi-agent architectures. • Optimise agent workflows for reliability, latency, scalability, and cost. Production Engineering • Deploy AI applications into production environments. • Build APIs and services around AI agents. • Implement testing, logging, monitoring, tracing, and error handling. • Troubleshoot production issues and improve application reliability. • Contribute to CI/CD pipelines and automated deployment processes. LLM and RAG Integration • Integrate commercial and open-source LLMs into production applications. • Implement prompt templates, structured outputs, function/tool calling, and context management. • Develop RAG solutions using enterprise data sources. • Work with embeddings and vector databases where appropriate. • Evaluate model performance and optimise model selection, latency, and cost. Enterprise Integration • Integrate AI agents with REST APIs, databases, SaaS platforms, and internal business systems. • Develop secure tools and interfaces for agents to perform business actions. • Implement appropriate authentication, authorisation, validation, and access controls. • Ensure agent actions are auditable and appropriately controlled. Required Experience • Strong commercial experience with Python . • Hands-on experience developing applications using LangGraph . • Experience building and deploying LLM-powered applications or AI agents . • Experience developing production APIs and backend services. • Strong understanding of software engineering principles, testing, version control, and CI/CD. • Experience with REST APIs and enterprise system integration. • Understanding of LLM concepts including prompting, tool calling, structured output, embeddings, and RAG. • Experience deploying applications on AWS, Azure, or GCP . Desirable Skills • LangChain / LangSmith • Multi-agent architectures • Vector databases • Kubernetes and Docker • Infrastructure as Code • Event-driven architectures • AI observability and evaluation • AI security and guardrails • PostgreSQL or other relational databases • Redis or similar caching technologies

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