Lead Backend Engineer Elixir for Integrated Power Management (f/m/d)


Wildpoldsried, BY, DE Berlin, BE, DE Home Office, DE

Stellen-ID:  1707

At the earliest date possible we are looking for support for our #teamsonnen

Clean and affordable energy for all is one of the greatest challenges of our time. Sonnen has been committed to this mission since 2010 and is now represented in Europe, the USA and Australia with over 1,000 team members globally. In Germany, our offices are located in the beautiful Wildpoldsried (Allgäu) and the vibrating heart of Berlin Kreuzberg.

At sonnen, we are building the energy system of the future. To this end, we are developing new technologies and business models that have not existed before. Whether intelligent power storage, virtual power plants or digital services - we set the trends of a new energy world. That means, among other things, the inexpensive production and storage of renewable energy and the intelligent networking of producers and consumers. sonnen thereby gives people around the world the opportunity to become independent of fossil fuels and conventional energy supplier.

We are growing steadily and are looking for people who want to join us in our vision of clean and affordable energy for all while making a positive impact on climate change.

Team IoT develops and operates the backend for the integration of sonnenChargers and sonnenBatteries in all our markets. Our stakeholders are customers, partners of sonnen and internal teams like e.g. Virtual Power Plant (VPP), Technical Service, Data Science. The sonnenCharger is our smart charging solution which delivers sustainable and clean energy to our customers’ electric vehicles as a leading part of our sonnen product portfolio.


Our common goal is to build a good product. We combine a long and broad experience around IoT applications with a mindset, that problems can best be solved by code and collaboration. We foster decision making based on arguments by the people affected.


As part of the team IoT you will:

  • Take over a leading role in our Elixir software architecture

  • Develop and operate the sonnen IoT backend for integrated sonnenChargers, sonnenBatteries and 3rd party devices

  • Design solutions for all levels of the integration: backend software architecture, data architecture and functionality

  • Collaborate and share your knowledge with peer developers and stakeholders

  • Work in a remote team setup, optionally from one of sonnen offices in Berlin or near Kempten

Your profile:

  • You’ve seen different programming paradigms and you know when to choose which.

  • You have excellent knowledge in Elixir with proven experience

  • You have experience maintaining systems with high load, ideally from IoT devices

  • You feel comfortable with using Python / Jupyter notebooks for analysis and prototyping purposes.

  • You’ve already used Docker, AWS, Terraform, relational and NoSQL databases. You have a basic understanding of frontend / app technologies and know how to bridge the gap between frontend and backend development.

  • Automation and decision-making based on evidence has become a habit for you

  • Code excellence is important to you; your code is tested and can be easily understood and maintained by others

  • Your English is fluent, you are able to understand social conversation in German

What you can expect at sonnen:

  • An atmosphere of openness, tolerance and mutual respect, where innovation is expected and encouraged
  • The option of working full- or part-time for every position
  • 29-32 days annual vacation with increasing team membership
  • Leasing of company bikes with up to 40% discount
  • At sonnen, all positions can be filled full or part-time
  • Flexible working hours and home office option
  • Workation within the EU
  • Free German, English as well as online yoga and body art courses
  • Soft drinks, fruits and cereals in our offices
  • Regular team and company events
  • We love dogs! You too? Feel free to bring your fellow friend to our offices
  • Other benefits, such as discounts on sports memberships and other services or products

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!

sonnen - energy is yours!

Jobsegment: Manager, Management