Senior Full Stack Developer – Python, React & AI Platform

Our client is a key player in the European energy sector, dedicated to ensuring sustainable and reliable infrastructure. This role focuses on developing an advanced AI platform for internal communications, leveraging modern agent-based architectures and language models.

• Develop scalable backend services and APIs using modern Python frameworks to support AI-driven functionalities.
• Build responsive user interfaces and micro-frontends to facilitate seamless internal agent communications.
• Implement complex AI features including Large Language Models (LLM), Retrieval-Augmented Generation (RAG), and agent-to-agent architectures.
• Integrate secure identity management and authentication protocols within the cloud-native infrastructure.
• Manage containerized application deployments and automated CI/CD pipelines to ensure high code quality and reliability.
• Collaborate within an Agile team to design and refine technical solutions that support the energy transition.

• You have 8+ years of experience in backend development with Python and FastAPI.
• You possess 8+ years of experience in frontend development using React, JavaScript, and CSS.
• You bring proven expertise in AI agent creation, LLM, and RAG database development.
• You have significant experience with SQL Server, PostgreSQL, and SQLAlchemy.
• You're proficient in messaging systems like RabbitMQ and micro-frontend architectures using NX.
• You possess hands-on experience with Kubernetes and CI/CD pipelining via Azure DevOps or ArgoCD.
• You have a strong understanding of security protocols such as SAML, OAuth, and EntraID.
• You're experienced with testing frameworks like Pytest.
• You are proactive, accountable, and experienced in Agile and Scrum methodologies.
• You are fluent in English with a good level of Dutch and/or French.

Nice to Haves

• Experience with LangChain, LangGraph, or Copilot.
• Familiarity with A2A (Agent-to-Agent) communication frameworks.
• Knowledge of Micro-services architecture design patterns.

• Start date: ASAP or early May 2026
• Location: Brussels.
• Working model: Hybrid with 2 days onsite per week.
• Contract: open to both permanent employees and freelancers.