Ruby Backend Software Engineer (f/m/d)


Berlin, BE, DE Wildpoldsried, BY, DE DE

Stellen-ID:  4372

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.


What you will do to help drive energy transition:

  • Maintain and extend a Ruby on Rails based services. 
  • Build and maintain RESTful endpoints in JSON:API. 
  • Build and maintain GraphQL interfaces from backend services for frontend apps. 
  • Convert acceptance criteria into test cases written in RSpec framework. 
  • Write new and update existing documentation entries. 
  • Contribute to the implementation of micro-services. 
  • Push and follow up on builds and deploys, using CI/CD pipeline tools. 
  • Collaborate with a development team on the planning and implementation of tasks, troubleshoot of issues, and refactoring. 
  • Interpretate log messages and mitigate errors coming from our monitoring tools. 
  • Collaborate closely with cross-functional teams in an Agile development environment, familiar with a Software Delivery Lifecycle following SCRUM practices. 


What you will need for that journey:

  • 2+ years of experience with Ruby on Rails development and preferably first experience with Node.js
  • You are outspoken and have a clear communication style. 
  • You see feedback exchange as a normal part of your everyday work. 
  • You are open minded to follow instructions from other senior developers. 
  • You have an Agile mindset, understanding the concept of delivering iterations of small portions of working software since early stages. 
  • You are keen on following architectural paradigms. 
  • You have strong comprehension over Object Oriented Programming. 
  • You comfortably express your ideas and arguments in good spoken and written English.

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
  • 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
  • Mental health and wellbeing offering for you and your family members
  • Free German, English as well as online yoga and body art courses
  • Soft drinks, fruits and cereals in our offices
  • 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!

sonnen - energy is yours!

Stellensegment: Ruby on Rails, Testing, Developer, Technology