Senior Software Engineer – IoT & Energy Systems 100%

Ref 2588361 | Date: 30 Oct 2026 Sontex SA Sontex is a prosperous and rapidly expanding SME active in the development and manufacture of systems for measuring thermal energy, headquartered in the Bienne region. For 36 years, we have been developing, producing, and distributing precise devices used to record energy consumption. We help our customers use energy resources efficiently and save them. Our national and international clientele is active in the field of building technology and automation. To strengthen the Software team, we are looking for a Senior Software Engineer -- IoT & Energy Systems (m/f) 100%

Your main tasks

• Design, develop, and maintain an application (Windows and Android) allowing the configuration and parameterization of Sontex products and equipment via optical and NFC communication interfaces.
• Design, develop, and evolve a radio data collection platform intended for the management of remote metering infrastructures.
• Participate in the entire software development lifecycle, from needs analysis to production.
• Guarantee code quality by applying development best practices, modern methods, and test automation.
• Collaborate closely with external partners, Product Management, Hardware/Firmware teams, sales teams, and customers.
• Contribute to the planning, development, and deployment of new software versions.
• Provide level 3 technical support for software solutions.
• Write, maintain, and evolve technical documentation related to software developments.

Your profile

• Bachelor or Master in computer science/engineering or training deemed equivalent.
• Minimum 5 years of experience in industrial application development with Java.
• Experience in designing complex applications interacting with connected equipment or distributed systems.
• Experience with version control tools, continuous integration, and automated testing.
• Autonomous, responsible, and possessing good initiative, you communicate easily and know how to collaborate with multidisciplinary teams.
• Appreciated knowledge:
• Android
• Microservice architecture
• Jetpack Compose, Kotlin APIs
• Radio communication protocol (NFC, LoRaWAN, wMBus)
• Java FX
• SQL database
• Very good command of French and English (minimum B2 level); basic knowledge of German.

We offer you

• A hybrid work model with great flexibility.
• A corporate culture based on trust, integrity, competence, and personal responsibility.
• Support in professional development.
• A multicultural and international work environment as well as a collegial team.
• The development of innovative products that allow energy resources to be used efficiently.

If you wish to receive further information, you can contact Mr. Patrick Bucher, CTO at

Have we aroused your interest? We look forward to receiving your application accompanied by complete documents exclusively by e-mail at the following address: [Write an email](< >) Sontex SA, Rue de la Gare 27, 2605 Sonceboz, Switzerland. [ ](< >) jpid02628f4jm jpit1044jm jpiy26jm