Backend Developer

Deurne, Antwerp, Belgium on site Until 8/21/2026 3+ years exp First posted March 27, 2026 Last posted March 27, 2026
Job description

Want to grow together with a cutting-edge company, work with innovative software and put your passion for energy to use, all while helping to save the earth?

As a Backend Developer, you contribute to the “behind the scenes magic” of the Hysopt product suite on a daily basis. You help transform complex physical HVAC concepts and mathematical models into high-performance, scalable software that engineers rely on to design better systems.

This is what your week looks like:

  • You use modern technologies like Java, Spring Boot, and popular Java libraries
  • You develop API’s, business logic and algorithms in the heart of our software
  • You become a part of an experienced R&D team which is responsible for the full software development lifecycle, including implementation, architecture, devops, testing, requirements and maintenance

You recognise yourself in this:

  • Master in Computer Science, Computer Engineering or equivalent, with at least 3 years experience in Java backend development
  • Affinity with physics and/or mathematics, and interested in understanding the hydraulic and thermodynamic behavior of heating and cooling systems
  • Experience with the total lifecycle of software development, or eager in making it your own
  • Knowledge of the following technologies is an advantage: Java, Spring, Hibernate, Lombok, Mapstruct, Feign, OpenApi, MySql, Maven, Gradle, Intellij products, Amazon AWS and all its services, Docker containers, Atlassian products and OAuth 2.0
  • Experience with Scrum or Agile development methodologies
  • Fluent in English, Dutch is a plus

What’s in it for you:

  • Have a big impact on our company and the climate
  • Join a company that revolves around innovation and continuous learning, with the help of experienced colleagues, the usage of the latest technologies, and a training budget
  • Get an attractive salary with additional benefits, such as a company car, group insurance, etc.
  • Have the possibility to work part time from home

We are Hysopt

Hysopt is a rapidly growing SaaS company originating from the University of Antwerp. We develop physics-based HVAC engineering software that helps engineers design, analyse and optimise complex hydronic systems with confidence.

Our cloud platform enables better-informed design decisions, improved system performance and a smoother transition towards low-carbon building systems. By replacing rule-of-thumb calculations with accurate simulation, we support HVAC professionals in delivering efficient, reliable and future-proof solutions.

Applications are reviewed on a rolling basis, so speed is key. The sooner you apply, the quicker we can arrange an interview. Unfortunately we aren't in a position to sponsor candidate visas. If you don't have the independent right to work in Belgium we will not be able to progress your application.

About this role

Summary

Develop scalable backend software for HVAC engineering, transforming complex physical models.

Job title

Backend Developer

Experience level

3+ years

Minimum experience

3+ years exp

Industry

software

Location requirements

Deurne, Antwerp, Belgium; partial remote work allowed.

Salary

not specified

Management role

No

Skills & keywords

Required skills

JavaSpringHibernateMySQLDocker

Preferred skills

AWSOAuth 2.0AgileScrum

Specializations

JavaSpring BootAPIsMathematicsThermodynamics
Locations

Structured locations inferred from the posting.

Deurne, Antwerpen, Belgium

On-site City