(Senior) Product Engineer (m/f/d)

About the Position

1KOMMA5° is on a mission to make renewable energy accessible and efficient for everyone. Join us as a (Senior) Product Engineer (m/f/d) and help shape the future of energy systems with AI and scalable software.

Responsibilities

• Own feature development end-to-end, from problem framing to production deployment and long-term maintenance
• Build and integrate AI-powered product experiences using LLMs, agents, and tool-use patterns
• Define feature scope together with PMs - engage with the "why", not just the "what"
• Contribute to architectural decisions, API design, and AI integration patterns across the teams
• Keep feedback loops short: prototype, ship to real users, observe, adjust
• Push back when something doesn't make sense and propose better approaches

Requirements

• Strong fullstack proficiency in TypeScript, React / Next.js, and Node.js / NestJS
• Real, demonstrable experience building with LLMs, APIs, or MCPs - production use preferred
• A product and customer mindset: you think about user problems, not just implementation elegance
• Proven ability to own features end-to-end, from rough problem statement to shipped, maintained product
• Experience working closely with PMs and designers in a cross-functional team
• Excellent written and spoken English; German is a plus
• Residency in Germany

Nice to Have

• Experience with agentic systems, tool-use patterns, or RAG pipelines
• Familiarity with the energy market, construction, sales, or climate tech context
• Prior experience in a startup or scale-up

We Offer

• Be part of an international, dynamic, and highly motivated team
• Accelerate the "energy transition" and have a direct impact on our climate
• Work with and learn from other super-smart colleagues
• Enjoy direct contact with core decision-makers
• Best chances of entering full-time in one of Europe’s most thriving scaleups
• Work remotely (Germany-wide), with offices in Hamburg, Berlin, or Munich
• Create a healthy work-life balance with EGYM Wellpass
• Benefits and discounts with Futurebens
• Flexible job bike leasing to contribute to the environment

About the Company

"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°)