Senior Software Engineer - Energy Markets (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.

Want to take responsibility and build solutions that truly matter? Apply now and help us shape the energy world of tomorrow.

Become a part of our mission and learn about our Product & Tech team!

We are looking for a Senior Software Engineer - Energy Markets to drive the technical direction of our Energy Markets workstream, with the potential to grow into a lead role.

Key responsibilities include:

• Build and optimize backend services for VPP operations and energy market integrations
• Design systems at the intersection of backend and data processing pipelines
• Drive technical decisions and guide fellow engineers on architectural choices
• Navigate between data engineering, backend engineering, and energy market domains
• Collaborate with product managers, data engineers, and data scientists across team boundaries

The successful candidate will have:

• Proven experience developing scalable backend solutions with TypeScript
• Data engineering fundamentals — designing systems bridging backend and data processing
• Hands-on experience with energy service interfaces (smart meters, optimization, load balancing)
• Strong knowledge of architectural patterns, CI/CD (GitHub Actions), and cloud infrastructure (GCP preferred)
• Ability to guide architectural decisions, mentor engineers, and coordinate across domains
• Passion for maintainable, documented, and testable code Bonus points for:
• Experience building virtual power plant infrastructure and energy market integrations
• Python and BigQuery experience in Data Engineering or Machine Learning contexts
• IoT experience for grid balancing and demand response
• Infrastructure as Code experience (Terraform)
• Familiarity with energy market APIs (EPEX Spot, Montel)