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

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.

Learn about our Product & Tech team!

• →Own feature development end-to-end, from problem framing through production deployment to long-term maintenance
• →Define feature scope together with PMs and engage with the "why", not just the "what"
• →Drive technical decisions and guide fellow engineers on architectural choices
• →Keep feedback loops short: prototype, ship to real users, observe, adjust
• →Use AI tools to amplify your impact and explore AI-powered product opportunities where they make sense
• →Push back when something doesn't make sense and propose a better direction
• →Improve developer experience by reducing tech debt, automating workflows, and documenting decisions and runbooks

As part of one of our teams around Heartbeat AI, you will help building our virtual power plant leveraging our energy manager "Heartbeat", and continuously ship innovative energy market solutions to our customers.
This is a builder role at the intersection of engineering and product: you co-own the product, define what gets built together with your cross-functional team, ship it fast, and use AI as a force multiplier along the way. Cloud Architects and SREs will enable you to easily deliver and run software in a consistent, secure, and reliable way.

• TypeScript, NestJS, Next.js, Flutter
• AI-assisted development with Cursor and agentic coding workflows
• SQLMesh, BigQuery, Looker
• GCP, Vercel, GitHub Actions, Datadog
• Linear, Notion, Figma, Miro

• Solid backend engineering skills with a strong grasp of distributed systems; TypeScript experience is a plus but not required
• Experience with at least one frontend framework
• Familiarity with cloud infrastructure, CI/CD pipelines, and observability tooling; you understand how your code runs in production
• Proven ability to own features end-to-end, from rough problem statement to shipped, maintained product
• A product and customer mindset: you think about user problems, not just implementation elegance
• Experience working in cross-functional teams with product managers and designers
• You actively seek input from your peers and create visibility where it's lacking
• Comfortable with ambiguity and proactive about asking for what you need to get the job done
• Excited to leverage AI tools to enhance your impact, including agentic coding
• You communicate ideas clearly and concisely in written and spoken English

Ideally You Also Bring One of These
You check at least one of these boxes. It's how we match you to the right team:

• Flutter or mobile development experience
• Data engineering fundamentals (BigQuery, data pipelines)
• Hands-on experience with energy systems, IoT, or climate tech

• German language skills
• Experience building AI-powered product features (LLMs, agents)
• Prior experience in a startup or scale-up environment