AI & ML Engineer

Turning data into intelligent solutions and algorithms into real-world impact. As an AI/ML Engineer, you bring AI to life : designing, building and optimizing intelligent applications that truly serve end users. You develop GenAI features, craft robust backend systems and APIs and collaborate with data and ML engineers to scale impactful models. You make sure our AI runs smoothly, stays cost-efficient and keep pushing the boundaries by experimenting with new capabilities that shape our customer facing gen AI roadmap. What you’ll do Using LLMs like OpenAI or open-source models, you build GenAI agents, workflows and backend services. You align AI capabilities with real business value and user needs. You translate customer pain points into smart, scalable technical solutions. Implementing guardrails and fallback mechanisms, you optimize for cost, speed and stability. You collaborate with Data/ML Engineers, frontend, QA and product teams across the full AI lifecycle. You share best practices through internal libraries, design patterns and Luminus’ Data & AI Community. What you bring You have strong programming skills in Python and experience with frameworks like FastAPI or Flask. You have at least 2 years of experience in a professional context. You bring hands-on experience with LLMs, prompt engineering, RAG and model evaluation. You’re comfortable working with APIs, cloud services and DevOps pipelines. You have a sharp analytical mindset with a focus on robustness and maintainability. You communicate clearly and collaborate with ease. Fluent English is required. Fluency in Dutch is preferred to strengthen team complementarity; French is an additional advantage. What you’ll get in return? The energy sector is one of the most rewarding industries in Belgium with a highly rewarding compensation and benefits package: Competitive compensation: Attractive salary with a performance-based bonus that can be optimized to your personal preferences, plus meal vouchers. Insurance & social benefits: Group insurance and hospitalization coverage for the entire family. Additional reimbursement for healthcare and pharmaceutical costs. Mobility: Full reimbursement for public transport, kilometer-based cycling reimbursement and flexible mobility choices: you can choose between a company car or mobility budget. Internet & communication: Home internet covered, reimbursement for a personal mobile device with a phone subscription. Home Office: A fully-equipped home office, including an ergonomical ICT set-up. Exclusive discounts: 30% off gas and electricity after six months, discounts on energy-saving services (e.g., solar panels, heat pumps) and reduced prices on top brands, amusement parks, festivals and more. You will be part of a company that drives key changes towards a more sustainable and energy-efficient society. You join a team of motivated people with diverse and strong skills, offering you real opportunities to grow and learn. You take ownership of projects and make a real impact by defining not just how we do things, but also what we should do. You work and connect with your colleagues at a Luminus office or from home. Need some flexibility? Your manager is open to discuss what works. Luminus values e.v.e.r.y individual. Are you looking for a workplace where you can truly be yourself, where you feel respected, supported regardless of your background, identity and unique story? Then you’ve come to the right place. Diversity equity and inclusion are not empty words for us — we grant that everyone can flourish and feel valued, so let’s build it together! What does that mean in practice? Do you have specific needs or require adjustments during the recruitment process or once you are hired? Let’s discuss about it and we’ll do our best to find a solution. We can also discuss if you want to work at 80% or 100%. Together we make the difference