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

• 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 and contribute to architectural decisions, API design, and AI integration patterns.
• Keep feedback loops short: prototype, ship to real users, observe, adjust.

You will accelerate the energy transition by building the intelligent energy system of the future, helping transition 1.5 million households to renewable energies by 2030.

• 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.

• International, dynamic, and highly motivated team.
• Direct impact on climate through your work.
• Work with and learn from other super-smart colleagues.
• Direct contact with core decision-makers.
• Best chances of entering full-time in one of Europe’s most thriving scaleups.
• Remote work (Germany-wide) with offices in Hamburg, Berlin or Munich.
• EGYM Wellpass, Futurebens discounts, and job bike leasing.

1KOMMA5° is building the energy system of the future with Heartbeat AI, integrating solar, batteries, heat pumps, and e-mobility into an intelligent virtual power plant to enable living on wind and sunlight forever for free.