AI Product Engineer / Senior AI & LLM Software Engineer (m/f/d), Luxembourg on-site, 6 months

Project overview

For an exciting project in the energy sector in Luxembourg, we are looking for an experienced AI Product Engineer / Senior AI & LLM Software Engineer (m/f/d) with a strong software engineering background and hands-on experience building LLM-based applications and AI agents.

The focus of the role is to further develop an existing agentic AI platform and turn prototypes and AI assistants into robust, tested and production-ready solutions.

Your Responsibilities

• Turn existing AI/LLM prototypes into production-ready applications
• Develop and extend backend services, APIs and enterprise integrations
• Build applications using LLMs, AI agents, tools/skills and RAG
• Implement LLM evaluations and guardrails
• Develop automated tests and technical documentation
• Integrate enterprise systems and LLM gateways
• Build usage and cost monitoring, including dashboards and alerts
• Support and improve existing AI assistants
• Support migrations to new model providers
• Work closely with the Product Owner and Backend Engineer
• Conduct code reviews, pairing sessions and knowledge transfer

Requirements

• 5+ years of software engineering experience
• Ideally 1–2 years of hands-on experience building LLM-based applications
• Strong backend development skills in Python and/or TypeScript
• Solid experience with APIs, services and system integrations
• Hands-on experience with AI agents, RAG, LLM evaluation and guardrails
• Proven experience with AI-assisted development tools / coding agents
• Familiarity with containers, Kubernetes, GitOps and CI/CD
• Experience with LLM gateways, such as LiteLLM, is a plus
• Proactive and autonomous working style with the ability to take ownership end-to-end
• Fluent English

Project details

• Start: 16 November 2026
• Duration: 6 months / approx. 132 days
• Workload: Full-time, 5 days per week
• Location: Luxembourg, primarily on-site
• Start: date 11/2026
• Duration: 6 months
• Remote: onsite
• Location: Luxemburg, Luxembourg, LU
• Languages: English