Test Engineer Python (m/w/d)
sonnen
Company Overview
Sonnen GmbH, a subsidiary of Shell
Wildpoldsried, Bavaria, Germany
2010
Over 700 employees worldwide (as of 2020) (source: wikipedia.org). Revenue data is not publicly available as the company is private.
What They Do
Sonnen GmbH is a leading company in the field of intelligent lithium iron phosphate (LiFePO4) home storage systems that are safe and sustainable. The products are designed to store excess energy from photovoltaic systems and promote energy independence for users. Key products include the modular sonnenBatterie, available in various sizes, as well as solutions like sonnenCommunity, which allows users to share renewable energy (source: sonnengroup.com). Sonnen has evolved from a battery manufacturer to an energy provider and operates one of the largest virtual power plants in the world, based on home storage systems.
Projects & Track Record
Notable projects by Sonnen include the sonnenCommunity, which connected over 50,000 households by 2020, enabling them to share renewable energy in a decentralized manner. By 2020, over 90,000 sonnenBatterien had been installed worldwide, allowing households to act as "small power plants" (source: sonnengroup.com). The production facilities in San Jose, California, and Atlanta, Georgia, support the U.S. markets and research and development. Sonnen has also partnered with companies like ES Solar and Haas Home Technologies to offer integrated solar battery solutions.
Recent Developments
In the past two years, there have been no major announcements or acquisitions; however, the acquisition by Shell in 2019 was confirmed in July 2023 (source: kfw.de). Sonnen continues to have over 90,000 installations and offers a standard 10-year warranty on its products. The ten-year anniversary celebration in 2020 highlighted the company's achievements, including connecting over 50,000 households and reaching a workforce of 700.
Working There
Sonnen offers a variety of roles in engineering, manufacturing, sales, and energy supply. The workforce has grown from 200 to over 700, indicating increasing demand in technical and expansion-oriented departments (source: wikipedia.org). The company culture fosters innovation and a decentralized team that operates in the rural environment of Bavaria while also acting globally. The headquarters is located in Wildpoldsried, where the core production of 1,000 units per month takes place.
Last updated on Feb 23, 2026 | Report an issue
Job Description
At sonnen, we're driven by a clear goal: creating a future powered by clean, affordable energy for everyone. That's why we make our customers independent - not only from fossil fuels, but also from rising electricity costs.
The key to this independence is our intelligent, all-in-one energy system. It combines solar panels, battery storage, energy tariffs, and wallboxes - all developed and manufactured in Germany.
As the first and only provider in Germany, we also connect thousands of home batteries into one shared network: the sonnenVPP, our industry-leading virtual power plant.
In short: every day, we're working to shape the energy future. And we'd be thrilled to have you join us!
What you will do to help drive the energy transition
- Developing innovative sonnen energy storage products
- Verifing and testing of state of the art analog and digital electronics
- Develop automated test equipment for electronic assemblies
- Accompany and support product development by continuously testing
- Support product compliance team and provide verification reports
- Close collaboration with cross-functional and international project teams as well as external partners
- Identify opportunities to optimize existing product designs and mechanisms
What you will need on that journey
- University degree in electrical or mechatronics engineering
- Strong experience in hardware testing of embedded systems and knowledge of hardware test methodologies (verification, reliability, compliance testing)
- Solid experience (+3 years) in analog and digital electronics
- Solid experience (+3 years) in developing and maintaining electrical test facilities
- Proficiency in Python and C++ as well as Altium as design tool
- Proficiency with hardware design standards, EMI/EMC compliance and regulatory certifications
- Understanding of industrial communication protocols
- Familiarity with renewable energy technologies is a plus
- Strong analytical thinking, problem-solving skills, and an independent, structured, proactive work style
- Good communication skills and a collaborative mindset in a transparent work environment
- Fluent in written and spoken English
Apply now
Job expired?Please let sonnen know you found this job on Rejobs. This will help us grow and get more people to work on renewable energy!
Apply now
Job expired?Please let sonnen know you found this job on Rejobs. This will help us grow and get more people to work on renewable energy!
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About the role
May 19, 2026
Full time
Company
- Cairo, Egypt
3+ years
UTC+02:00
