(Senior) Product Engineer (mfd)

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 itWe bring together regional craftsmanship and scalable software: We dont 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 3000 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

You will help shape the virtual assembly line team - our intelligence workflow engine building solutions in Growth and Operations to scale our products globally with maximum efficiency and quality. This is a builder role at the intersection of engineering and product: you co-define what gets built ship it fast and use AI as a force multiplier at every step.

As a (Senior) Product Engineer at 1KOMMA5 you will take end-to-end ownership of features and workflows making key decisions on architecture integration layer and solution design. Youll collaborate closely with product managers designers and engineers across teams to ship things that genuinely move the needle for our customers - and you wont be shy about challenging assumptions or proposing a better direction.

Our Stack:

• TypeScript React / (frontend) and / NestJS (backend)
• AI-assisted development with Cursor and Claude Code
• GCP / Vercel GitHub Actions (CI/CD)
• Linear Notion Figma Miro

Key responsibilities include but are not limited to:

• 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 doesnt make sense and propose better approaches

Dein Profil

• Strong fullstack proficiency in TypeScript React / and / 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 GermanyBonus points for:
• 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

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 Europes 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