Software Engineer (Python) - IoT & Energy Flexibility Markets

Join ThermoVault and shape the future of energy!

ThermoVault is a growing scale-up on a mission to make energy smarter, greener and more efficient. With our cutting-edge IoT hardware and software, we transform everyday thermal appliances like water heaters, accumulators, and heat pumps into intelligent, grid-responsive storage devices. The result? Households automatically save 15-25% on energy, without lifting a finger or sacrificing comfort. In 2025, this represented 750 MWh of savings.

Backed by our main shareholder, Ariston Group, a worldwide leader in heating and hot water solutions, we are scaling fast. We are already managing almost 9,000 installations across Belgium, France, and Italy, with plans to expand into South Africa and beyond. By controlling how and when these appliances use electricity, we help balance the grid and secure contracts with energy players like TSOs, driving our recurring revenue model.

But we are not stopping at retrofits. Our technology is now built directly into Ariston’s next-generation appliances, unlocking a global market. As this continuous stream of native devices accelerates our growth, we face an exciting challenge - and this is where you come in!

We are looking for a motivated all-round IT profile to build the essential tools needed to onboard, monitor, and manage this rapidly expanding fleet.

Your responsibilities

• Maintain, monitor and optimize our cloud infrastructure (AWS) to ensure our services are highly available and cost-efficient.
• Manage a robust pipeline to ingest real-time data from thousands of distributed electrical assets (+500M messages per month, growing rapidly).
• Integrate forecasting, modelling and steering algorithms seamlessly into the cloud ensuring it runs efficiently in a cloud-native environment.
• Use CI/CD pipelines to set up automated tests ensuring easy but robust deployments. Reliability is the most important metric.
• Set up and manage monitoring tools to detect anomalies before they impact the grid or end users.

You will be collaborating with all involved experts, including ThermoVault’s Demand Response and Product Development teams and the Ariston team on commercial projects on a European scale. You will work in a highly-motivated scale-up environment with a strong focus on delivering real-world solutions.

Your profile

You hold a Master of Science in Engineering (Computer Science) or a Master of Science in Engineering Technology (ICT).

Technical Core: Proficiency in Python and Git is essential.

Technical Pluses: Experience with or knowledge of the following is highly valued:

• Linux & Containers (Docker, Kubernetes)
• Databases (SQL/noSQL, Timeseries)
• Cloud Platforms (AWS, Azure, or GCP)
• Cloud Architectures (Micro-services, Serverless, Cloudformation)
• CI/CD automation

Experience: You have data engineering experience in a production-grade software environment. Knowledge of backend systems and/or cloud automation in real-time environments is a big plus.

Mindset: You have an operational, hands-on mindset. You are analytical and structured, but also pragmatic. You prefer the straightest, most effective path to a solution that works in the real world.

Soft Skills: You work well independently while remaining a dedicated collaborator within the technical team. Fluency in English is required; Dutch is a plus.

Last but not least, you identify with ThermoVault’s core values: ownership, excellence, and commitment to delivery.

What’s in it for you?

• Make an impact. Be part of a fast-growing scale-up leading the energy transition.
• Work with cutting-edge technology. Shape the future of smart energy solutions.
• Go International. Join a company backed by Ariston Group (active in 150+ countries) and scale with us.
• Hybrid work. Mix of home office & HQ in Leuven next to the train station (Mon-Wed-Fri in-office).
• Great team & culture. Work with 15 ambitious, high-performing colleagues who get things done - while having fun.
• Competitive package. A full-time permanent contract with an all-in yearly package between €50,000 and €90,000, depending on your relevant professional experience and technical skills.

Ready to join a scale-up with real impact? Let’s team up!

Join ThermoVault and be part of a young, dynamic team revolutionizing energy. Together, we will shape the future of smart energy and make a difference for our planet.