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1KOMMA5 Logo 1KOMMA5 · IT - Software Development

Senior Full-stack Software Engineer - Payments

Germany, Berlin · Job Posted March 19, 2026
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Job Description

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. 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.

Job Responsibility

  • Architect the financial engines that power the global energy transition at scale
  • Build robust payment lifecycles and seamless checkout experiences
  • Take technical ownership of key systems and features, driving architectural decisions and ensuring scalability, reliability, and performance
  • Collaborate closely with other engineers, product managers, and stakeholders to shape technical direction and deliver high-impact solutions
  • Mentor teammates, champion engineering excellence, and help evolve development and deployment practices
  • Contribute as a Full-stack engineer within a team of self-driven software developers
  • Design, build, and maintain business-critical systems across the stack
  • Translate complex and loosely defined business problems into clear, actionable technical solutions
  • Champion clean architecture, component reusability, and maintainable UI patterns using modern frameworks
  • Drive experiment-driven innovation and uphold strong engineering practices in testing, CI/CD, observability, and code quality
  • Continuously improve developer experience by reducing technical debt, automating workflows, and documenting key decisions and operational processes
  • Operate effectively in an asynchronous, outcome-oriented environment, managing work autonomously and maintaining clear communication
  • Contribute to lightweight project management by defining milestones, ensuring technical feasibility, and aligning engineering work with product goals

Requirements

  • Experience writing maintainable, reusable, and testable code in TypeScript, with strong skills in both frontend frameworks and backend technologies
  • Strong understanding of API design, data modeling, and system integration (RESTful or GraphQL)
  • Proven ability to own features end-to-end, from UX and architecture to deployment and monitoring
  • A pragmatic, product-focused mindset that balances technical excellence with delivering customer value
  • Curiosity and initiative to explore new tools and methods that improve product quality and engineering efficiency
  • Excellent written and spoken English
  • Residency in Germany

What we offer

  • Part of an international, dynamic, and highly motivated team
  • Work accelerates the energy transition and has 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 balance alongside your work and enjoy all the benefits of the EGYM Wellpass
  • Benefits and discounts are yours with Futurebens
  • Job bike leasing (city bike or e-bike)
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