1KOMMA5° is pursuing one clear vision: Live on wind and sunlight, free of charge, forever. With Heartbeat AI we are building the energy system of the future. Join us!
We combine local craftsmanship with scalable software, connecting PV, batteries, heat pumps and e-mobility into one intelligent, real-time controlled virtual power plant. By 2030 we will switch 1.5 million households to renewable energy.

Your mission: As a Full-Stack Software Engineer – Payments you architect the financial engines that make the global energy transition scalable. From robust payment lifecycles to frictionless checkout, you ensure adopting clean energy is as easy as any online purchase.

Your responsibilities:

Design and implement business-critical payment & subscription flows (backend & frontend)
Take ownership for scalability, reliability and performance
Work with TypeScript, Next.js, NestJS, Postgres, Auth0, GCP, CI/CD and IaC
Drive clean architecture, testing, observability and continuous developer experience

What you bring:

Several years of experience as a full-stack engineer with TypeScript and modern frameworks
Strong API design, data modelling and systemic thinking skills
Pragmatic, solution-oriented mindset focused on customer value
Excellent English and residence in Germany

We offer:

Remote work (Germany-wide) and offices in Hamburg, Berlin or Munich
Direct impact on climate protection and the energy transition
EGYM Wellpass, job-bike leasing, Future-Benefits and more
Flat hierarchies, fast decisions, highly motivated tech team

(Senior) Full-Stack Software Engineer – Payments (m/f/d)

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