Software Engineer Elixir / Rust (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!
Our Virtual Power Plant is a one-of-a-kind platform to provide grid services with sonnenBatterie-systems. By connecting household battery energy storage systems to our VPP, sonnen allows its customers to participate in ancillary services such as frequency control and demand response, further enabling the renewable energy revolution.
What you will do to help drive energy transition
- Contribute to a distributed Virtual Power Plant controlling tens of thousands of home battery systems across 8 countries in real time
- Design, analyze, and improve algorithms for grid services - FCR, intraday trading, demand response, and spot optimization
- Develop algorithms that optimize energy use within individual households, balancing self-consumption and cost savings under dynamic energy prices
- Build and run simulations to model real battery behavior and validate algorithmic decisions
- Analyze data streams to monitor system health and develop new signals that add value to the VPP
- Implement protocols, backend services, and client features in a production Elixir/Rust codebase
What you will need on that journey
- Experience with Elixir, Rust, or Erlang - or strong motivation to learn. We hire at all experience levels.
- Solid foundation in algorithms and mathematics; you enjoy working through problems that don't have obvious solutions
- Comfortable reasoning about distributed systems, concurrency, or real-time constraints - or eager to develop that understanding
- Experience with functional programming (Clojure, OCaml, Haskell, Scala) or Python is a plus
- Fluent in English. German is a plus.
What you can expect at sonnen
- An atmosphere of openness, tolerance and mutual respect, where innovation is expected and encouraged
- 30-32 days annual vacation with increasing team membership
- Leasing of company (e-)bikes with up to 40% discount
- Flexible working hours and option working mobile
- Use of sports memberships (EGYM Wellpass, only €29.75/month) and discounts for other services and products
- Employee discount on our electricity tariff
- Regular team and company events
- We love dogs! You too? Feel free to bring your fellow friend to our offices
You feel we are a match? Apply now and help us to shape the energy transition together. We look forward to welcoming you to #teamsonnen!
Apply now
Job expired?Please let sonnen know you found this job on Rejobs. It helps us grow and get more people working in renewable energy.
Apply now
Job expired?Please let sonnen know you found this job on Rejobs. It helps us grow and get more people working in renewable energy.
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About the role
June 30, 2026
June 30, 2026
Full time
Flexible
Company
Solar Energy, Energy Storage, Smart Grid
- Wildpoldsried, Germany
- Berlin, Germany
All experience levels welcome
UTC+01:00
