HAPEKO Deutschland GmbH | Germany | 50xxx, 53xxx, 51xxx Köln, Bonn | Permanent position | Part time - flexible / Full time / Home office | Published since: 24.02.2026 on stepstone.de
Software developer for the energy transition – also part-time from 30 hours (m/f/d)
Our client is an owner-managed company and specialist in electrical engineering plant engineering and soft and hardware development for the energy industry, based in the Cologne/Bonn area. For over three decades, the successful medium-sized company has been active on the market and impresses with a stable economic environment and attractive prospects for the future in the field of renewable energy and smart grid. In addition to a balanced work-life balance, flexible working hours, extensive home office options and short decision-making, our client offers an exceptionally good working atmosphere and state-of-the-art jobs.
To strengthen the motivated team, we are looking for a software developer in the frontend or backend area (m/w/d), who develops an innovative software solution in the Smart Grid area in a motivated team. The focus is either on the web-based user interface (C#/ASP.NET) or in the area of the data platforms and interfaces (Apache Kafka).
If you have (first) experience in software development, want to have an exciting and long-term project in the field of digitalization and want to work in a well-functioning, small team, we look forward to your application. Our client is looking for candidates (m/w/d) who would like to help shape the energy transition and develop it with high quality standards. (MJU26-180692)
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Your tasks • Your profile • What we offer
You are responsible for developing the innovative software solution in the pilot phase in the smart grid sector You either ensure the scalability of the software solution or develop the web-based user interface You implement the requirements of the legislator or the relevant authorities in design and programming that are binding to customers and continuously supplement the software with new functionalities You document and test the developed software and thus ensure the appropriate quality You are in regular exchange with other specialist departments and also point-by-point with customers
You have completed an education or study in the field of computer science or have a comparable qualification (complete welcome) You have (first) experience in software development. An entry is possible with professional experience as well as as as a graduate or You could ideally gain first experience in one of the areas of C#, .NET, Apache Kafka, Java or Kotlin You are curious, work quickly into new technical topics and have a high self-motivation You have a high demand for their own work quality, act independently and are communicative
An indefinite working relationship as well as a long-term and exciting perspective with the possibility to shape the energy transition A varied, responsible task in an owner-managed business environment The opportunity to contribute actively and independently to the success of the company Very good work-life balance, flexible working time models (also possible part-time with 30 or 35 hours) including extensive home office options – in a convenient location Great cohesion within the team, an attractive salary package, state-of-the-art work equipment and best opportunities for professional and personal development
Location
 | HAPEKO Deutschland GmbH | |
| Köln, Bonn | ||
| Germany |
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