Back Office Analyst

As a Back Office Analyst, you sit at the heart of Luminus’ Optimisation department, ensuring accuracy, control and insight across complex energy market activities. You combine analytical depth with operational ownership, validating and invoicing optimisation activities while continuously strengthening data quality, automation and reporting. In a fast-evolving energy market, you play a key role in protecting Luminus’ financial interests and supporting smarter decision-making.

What you’ll do

• You own end-to-end validation and invoicing for assigned Ancillary Services activities, acting as subject matter expert and defending Luminus’ interests with external counterparties.

• You analyse balancing and ancillary services results, identify root causes of discrepancies or penalties and translate insights into corrective actions.

• You design and maintain control, tracking and reporting tools to ensure transparency on invoice flows, exposure and cash impacts.

• You contribute to financial forecasting and ad-hoc impact analyses for new projects or regulatory changes.

• You drive automation, data quality and continuous improvement using analytical and BI tools, bridging operations and technology.

• You collaborate closely with Optimisation, Finance, IT and Generation teams to align data, processes and financial outcomes.µ

What you bring

• You hold a Master’s degree in Economics, Business Administration, Finance or a related field and bring 3–5 years of relevant analytical or operational experience.

• You have a strong affinity with the energy sector and a keen interest in energy markets, balancing mechanisms or ancillary services.

• You combine excellent analytical and critical thinking skills with a meticulous eye for detail and data quality.

• You communicate clearly and confidently, able to challenge discrepancies with fact-based arguments.

• You are proactive, structured and comfortable managing multiple priorities in a dynamic environment.

• You have strong technical affinity: advanced Excel is essential, while SQL, Python, VBA or BI tools are strong assets.

Benefits of working at Luminus

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.

• 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 work at the crossroads of generation, markets and finance in one of the most dynamic areas of the energy transition.

• You gain exposure to complex market mechanisms while actively shaping smarter, more automated back-office processes.

• You join a collaborative team where your analytical mindset and ownership truly make an impact.

• 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