• Design and develop robust, scalable, and high-performance web applications using **React** on the frontend and **Python** on the backend. • Build intuitive, responsive, and visually appealing user interfaces with modern React practices (hooks, functional components, state management libraries). • Develop and maintain RESTful APIs and backend services using Python frameworks such as Django or Flask. • Ensure seamless integration between frontend and backend systems. • Write clean, maintainable, and well-documented code following best practices and coding standards. • Optimize applications for maximum speed, scalability, and responsiveness. • Collaborate with cross-functional teams to define, design, and ship new features. • Participate in code reviews, architecture discussions, and technical decision-making. • Troubleshoot, debug, and upgrade existing systems to improve performance and reliability. • Implement security and data protection best practices across applications.

• Design, develop and maintain software applications • Participate in the entire software development lifecycle • Collaborate with project, business analysts and QA teams • Provide technical support and guidance to end users • Prepare appropriate documentation for supporting and maintaining systems

• Collaborate within an agile cross-functional team, closely working with the product owner to outline products and strategies • Design application architectures and establish technical solutions for the provided services • Work closely with other software engineers in a friendly and collaborative environment • Ensure adherence to best practices, coding standards, and security requirements. • Advocate for continuous improvement in development processes and technologies

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. Learn about our Product & Tech team! Deine Position We are looking for a Senior Software Engineer - Backend with an interest in full stack development to join our Site Config team. You will help to design, build and shape the solutions that enable the seamless setup and configuration of our customers’ Home Energy Management Systems (HEMS). We are the layer between our IoT fleet and our customers and installers, and we are scaling fast - join us! You will collaborate as part of our cross-functional team of frontend engineers, backend engineers, a product manager and a designer. Cloud Architects and SREs will enable you to easily deliver and run software in a consistent, secure and reliable way. Our Stack: TypeScript, NestJS, NextJS, Flutter, GCP, Vercel, Cursor, Datadog As a Senior Backend Engineer, you will: - Plan, build and shape multiple business critical applications and integrations - Thoughtfully create, implement, evaluate and deploy software solutions to solve complex problems in an elegant way - Lay the foundation and architecture to scale globally - Foster a culture of experiment-driven innovation within the team - Promote teamwork and successful project execution - Improve developer satisfaction by constantly avoiding/reducing tech-debt, automating as much as possible and documenting decisions, runbooks etc. - Work across your boundaries and interact in close collaboration with our stakeholders and other teams Dein Profil You check many of the following boxes: - Proven experience in developing, shipping and monitoring scalable backend software solutions with TypeScript from several past projects - Experience with NestJS in large scale applications is a clear plus - otherwise, experience with similar frameworks - Able to communicate ideas clearly and concisely both in written and spoken form (our working language is English) - You actively seek input from your peers and create visibility where it’s lacking - A broad knowledge of architectural patterns and experience implementing them with modern devops best practices - Worked in a cross-functional team being responsible for the full software development lifecycle, including leading project orchestration - Interest in wearing different (metaphorical) hats. We expect our engineers to engage in product thinking and care deeply about business impact - You feel comfortable with ambiguity and ask for what you need to get the job done - You are excited to leverage AI tools to enhance your impact, including agentic coding 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 provide everyone with renewable energy technologies. Bonus points for: - Experience in Next.js or Flutter - We are experimenting with more fullstack roles, though you will remain primarily a backend expert - Experience with CI/CD using GitHub Actions and cloud infrastructure (GCP/Vercel) - A passion for the home energy and renewable sector Benefits - You are part of an international, dynamic, and highly motivated team of people who have a proven track record of making 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 scale-ups - 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