Senior Software Engineer - JavaScript Fullstack (m/w/d)

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. You will architect the financial engines that power the global energy transition at scale. By building robust payment lifecycles and seamless checkout experiences, you’ll ensure that adopting sustainable energy is as friction-less as it is impactful. As a Software Engineer at 1KOMMA5° , you will take technical ownership of key systems and features, driving architectural decisions and ensuring scalability, reliability, and performance. Contribute as a Full-stack engineer within a team of self-driven software developers

From scalable backend services to performant, user-friendly frontends

Continuously improve developer experience by reducing technical debt, automating workflows, and documenting key decisions and operational processes

Contribute to lightweight project management by defining milestones, ensuring technical feasibility, and aligning engineering work with product goals

TypeScript / JavaScript

js for frontend applications

Experience writing maintainable, reusable, and testable code in TypeScript , with strong skills in both frontend frameworks and backend technologies

Strong understanding of API design , data modeling, and system integration (RESTful or GraphQL)

Proven ability to own features end-to-end , from UX and architecture to deployment and monitoring

Excellent written and spoken English

Benefits

You are part of an international, dynamic, and highly motivated team of people who have proven to make things happen

You will enjoy the best chances of entering full-time in one of Europe’s most thriving scaleups

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

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.