1KOMMA5° is building the energy system of the future. Our vision: Live forever for free on wind and sunlight. Heartbeat AI connects PV, batteries, heat pumps and e-mobility into one virtual power plant, trading electricity in real time. By 2030 we will switch 1.5 million households to renewables.

As (Senior) Full-Stack Software Engineer – Payments you architect the financial engines that move billions into climate tech. You make buying solar systems, batteries and heat pumps as friction-less as ordering a book – secure, compliant and delightful.

Your mission

Own the entire payment lifecycle: checkout, billing, dunning, refunds, subscriptions
Design and implement scalable, PCI-compliant services (NestJS, TypeScript, Postgres) and fast, accessible frontends (React/Next.js)
Integrate and orchestrate payment providers (Stripe, PayPal, SEPA, open-banking) and automate reconciliation & accounting
Drive test-driven development, CI/CD and observability (Datadog)
Reduce technical debt, document architectural decisions and level-up developer experience
Ship autonomously in async, outcome-oriented teams with clear milestones

Our stack

TypeScript, Next.js, NestJS, Postgres, Auth0, REST/GraphQL, OpenAPI
Infrastructure-as-Code on Google Cloud & Vercel
Datadog for monitoring & alerting

What you bring

4+ years of full-stack experience with TypeScript and modern frameworks
Solid payment domain knowledge (PCI-DSS, PSD2, tokenisation, webhooks)
Pragmatic, product-focused mindset balancing speed, security and scale
Residency in Germany and fluent English

What we offer

Direct impact on the energy transition and climate protection
Remote-first (Germany-wide) or offices in Munich, Berlin, Hamburg
Work with smart, motivated colleagues at the intersection of hardware, energy markets and software
EGYM Wellpass, job-bike leasing, Futurebens benefits
Competitive salary plus participation opportunities

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

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