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
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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.
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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