Backend Developer

Job description

Who we are

Opinum is a Belgian company founded in 2014 that created and ensures the continuous development of the "Opinum Data Hub" platform that has been designed for energy and environmental actors. 

Today, Opinum is the key partner of these actors in their digital transformation journey. Opinum Data Hub covers all stages of the data management value chain to allow its users to look beyond the complexity of data and focus on their core value and expertise. Opinum Data Hub is mainly intended for large private and public service companies, energy suppliers and companies with expertise in energy management (ESCO).

Our mission

Contribute to a more sustainable planet by providing cutting-edge technologies in the field of data management for energy & environmental actors to accelerate the digital transformation of the sector.

Our vision 

Digital technologies need to be developed and deployed with positive societal impact in mind. More importantly, digital technologies can pave the way for the energy transition by supporting the monitoring and tracking of human impact on the environment; optimising inefficient natural resources usage and energy distribution processes; and help people to better understand their consumptions.

Our Values 

Opinum’s culture is driven by a customer-oriented approach to build a company that last. Innovation and teamwork is at the heart of what we do to build the first Data Hub for energy & environmental actors. Trust is in every action we undertake with customers, employees and shareholders. People & this Planet are the reasons why we exist.

The job

You will be responsible for developing new features in .NET/C# for our Data Hub product , ensuring robustness, security and quality to completion. This responsible position involves using work procedures to analyse, design, develop, implement, maintain, re-engineer and troubleshoot the product. You will be part of a team of highly skilled developers, for whom teamwork, humility, creativity and humor are key values.


  • Use Microsoft technologies: C#, ASP.NET, SQL, to develop technical solutions to complex problems that require the regular use of ingenuity and creativity
  • Design, code, test, debug and document software according to the functional requirements
  • Develop, maintain and support programs/tools
  • Provide ad hoc reporting and analysis as required
  • Investigate operational or systematic problems and user queries as required
  • Produce project feasibility reports

Job requirements


  • Degree in computer science or a related field
  • Fluent in French and English
  • Minimum 2 years’ experience of using .NET development
  • Good understanding of database technologies (SQL and no-SQL)
  • Strong analytical skills
  • Attention to detail
  • Experience of working effectively as part of a team

Good to have: 

  • Experience in MongoDB
  • Experience in Big Data (specifically Cassandra)
  • Experience with Graph databases
  • Experience with Docker
  • Experience with Kubernetes


You will work in a young entrepreneurial and international environment where people are recognized as the source of the success of the company and will receive a competitive compensation package.