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Senior Fullstack Software Engineer - Ruby/ Typescript (m/f/d)

Permanent employee, Full-time · Hamburg, Remote, Berlin, München
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1KOMMA5°
At 1KOMMA5°, we pursue a clear vision: Living on wind and sunlight forever for free. To make this a reality, we are building the energy system of the future with Heartbeat AI. Want to be part of it?We bring together regional craftsmanship and scalable software: We don't think of solar, batteries, heat pumps, and e-mobility as isolated components, but control them as an intelligent, integrated overall system in our virtual power plant. Directly connected to the electricity market – in real time, fully automated. This way, energy is used when it is available from renewables and particularly cost-effective. By 2030, our goal is to transition 1.5 million households to renewable energies. Over 3,000 people are working towards this every day, at more than 80 locations worldwide, from Finland to Australia.
Want to take responsibility and build solutions that truly matter? Apply now and help us shape the energy world of tomorrow.

Become a part of our mission and learn more about our Product & Tech team!
Your mission
You will work on transforming the business of installing renewable technologies. With our core business software platform we streamline ground operations and rooftop installation to power the energy transition in private homes and small businesses world-wide.
As a software engineer in 1KOMMA5°, you will be part of a cross-functional team alongside frontend and backend engineers, product managers and UX/UI developers. You will help build a self-organized tech team, responsible for developing, deploying and running their own solutions to contribute to those work streams.
Key responsibilities include but are not limited to:
  • Core Development: Develop and maintain the core Rails application with a focus on code health, modern patterns, and long-term stability
  • ShapeUp Leadership: Lead technical implementation for complex projects within 6-week cycles, taking ownership from architectural design to shipping
  • System Integration: Build pragmatic connections between the Rails monolith and satellite TypeScript/GCP services (Pub/Sub, Cloud Functions) without over-engineering
  • Developer Experience: Proactively identify and resolve friction in tooling, CI/CD, and local environments to ensure the codebase remains enjoyable to work in
  • Technical Standards: Drive high-quality async collaboration through clear documentation, architectural decision records (ADRs or RFCs), and comprehensive code reviews
Technologies you will work with include:
  • Ruby / Ruby on Rails
  • TypeScript / JavaScript
  • Event Sourcing
  • Postgres, Firestore
  • Datadog
  • GCP (Pub/Sub, Cloud Functions)
  • Auth0
  • OpenAPI
Your profile
  • proven experience in writing maintainable, self-describing, reusable and testable code with Rails and other major back-end or full-stack technologies in several past projects
  • experience designing and maintaining RESTful APIs
  • experience with measuring and improving performance
  • an agile and result-oriented mindset and a passion to support your team colleagues
  • interest or experience in human-centered software development
  • excellent knowledge of spoken and written English, German is a plus
  • residency in Germany
  • We are an ambitious and dynamic company with a talented team. We require our engineers to be imaginative, enthusiastic, and willing to tackle new challenges as we strive to make an impact.
Benefits
  • You are part of an international, dynamic, and highly motivated team of people who have proven to make things happen
  • With your work, you accelerate the "energy transition" and hence have a direct impact on our climate
  • Work with and learn from other super-smart colleagues
  • You will enjoy direct contact with core decision-makers
  • You will enjoy the best chances of entering full-time in one of Europe’s most thriving scaleups
  • You work remotely (Germany-wide), with offices in Hamburg, Berlin or Munich
  • Create a healthy balance alongside your work and enjoy all the benefits of the EGYM Wellpass
  • Benefits and discounts are yours with Futurebens
  • Whether city bike or e-bike - be flexible with our job bike leasing and do something good for the environment at the same time
Apply for this job
About us
"At 1KOMMA5°, our vision is to accelerate CO2 neutral life for all! We created an easy one-stop-shop to buy and install solar, charging stations and heat pumps, with the purpose of liberating all European homes from the shackles of fossil fuels. With Heartbeat, we make clean energy smarter. Connecting our customers into one powerful clean energy operating system to enable flexible tariffs and to ultimately follow the rhythm of wind and sun!" - Philipp Schröder (CEO 1KOMMA5°)
1KOMMA5°
At 1KOMMA5°, we pursue a clear vision: Living on wind and sunlight forever for free. To make this a reality, we are building the energy system of the future with Heartbeat AI. Want to be part of it?We bring together regional craftsmanship and scalable software: We don't think of solar, batteries, heat pumps, and e-mobility as isolated components, but control them as an intelligent, integrated overall system in our virtual power plant. Directly connected to the electricity market – in real time, fully automated. This way, energy is used when it is available from renewables and particularly cost-effective. By 2030, our goal is to transition 1.5 million households to renewable energies. Over 3,000 people are working towards this every day, at more than 80 locations worldwide, from Finland to Australia.
Want to take responsibility and build solutions that truly matter? Apply now and help us shape the energy world of tomorrow.

Become a part of our mission and learn more about our Product & Tech team!
Deine Position
You will work on transforming the business of installing renewable technologies. With our core business software platform we streamline ground operations and rooftop installation to power the energy transition in private homes and small businesses world-wide.
As a software engineer in 1KOMMA5°, you will be part of a cross-functional team alongside frontend and backend engineers, product managers and UX/UI developers. You will help build a self-organized tech team, responsible for developing, deploying and running their own solutions to contribute to those work streams.
Key responsibilities include but are not limited to:
  • Core Development: Develop and maintain the core Rails application with a focus on code health, modern patterns, and long-term stability
  • ShapeUp Leadership: Lead technical implementation for complex projects within 6-week cycles, taking ownership from architectural design to shipping
  • System Integration: Build pragmatic connections between the Rails monolith and satellite TypeScript/GCP services (Pub/Sub, Cloud Functions) without over-engineering
  • Developer Experience: Proactively identify and resolve friction in tooling, CI/CD, and local environments to ensure the codebase remains enjoyable to work in
  • Technical Standards: Drive high-quality async collaboration through clear documentation, architectural decision records (ADRs or RFCs), and comprehensive code reviews
Technologies you will work with include:
  • Ruby / Ruby on Rails
  • TypeScript / JavaScript
  • Event Sourcing
  • Postgres, Firestore
  • Datadog
  • GCP (Pub/Sub, Cloud Functions)
  • Auth0
  • OpenAPI
Dein Profil
  • proven experience in writing maintainable, self-describing, reusable and testable code with Rails and other major back-end or full-stack technologies in several past projects
  • experience designing and maintaining RESTful APIs
  • experience with measuring and improving performance
  • an agile and result-oriented mindset and a passion to support your team colleagues
  • interest or experience in human-centered software development
  • excellent knowledge of spoken and written English, German is a plus
  • residency in Germany
  • We are an ambitious and dynamic company with a talented team. We require our engineers to be imaginative, enthusiastic, and willing to tackle new challenges as we strive to make an impact.
Benefits
  • You are part of an international, dynamic, and highly motivated team of people who have proven to make things happen
  • With your work, you accelerate the "energy transition" and hence have a direct impact on our climate
  • Work with and learn from other super-smart colleagues
  • You will enjoy direct contact with core decision-makers
  • You will enjoy the best chances of entering full-time in one of Europe’s most thriving scaleups
  • You work remotely (Germany-wide), with offices in Hamburg, Berlin or Munich
  • Create a healthy balance alongside your work and enjoy all the benefits of the EGYM Wellpass
  • Benefits and discounts are yours with Futurebens
  • Whether city bike or e-bike - be flexible with our job bike leasing and do something good for the environment at the same time
Apply for this job
Über uns
Die 1KOMMA5° Gruppe ist ein CleanTech Unicorn mit der Mission alles zu elektrifizieren und über unsere KI-basierte Software Plattform Heartbeat AI jeden an den Strommarkt der Zukunft anzuschließen. Wir sind das marktführende Unternehmen für die Installation von CO2-neutralen Energiesystemen, insbesondere bei Photovoltaik, Energiespeicher, Wallbox, Wärmepumpe und Energiemanagement. 1KOMMA5° vereint die besten Unternehmen Deutschlands, Europas und darüber hinaus – wir wachsen weiter und das weltweit.
Apply for this job
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