Software Engineer - Financial Infrastructure & Payments (m/f/d)
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About This RoleAI processing…
1KOMMA5° 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 partic
Key Responsibilities
- 1Contribute as a Full-stack engineer within a team of self-driven software developers
- 2Design, build, and maintain business-critical systems across the stack. From scalable backend services and APIs to performant, user-friendly frontends with reliable flows for invoices, payments, and subscriptions where they touch customers and finance
- 3Partner with finance, operations, and product to translate complex, loosely defined billing requirements into clear, actionable technical solutions , including compliance-minded documents and audit-friendly reporting where needed
- 4Own slices of the invoice lifecycle (generation, delivery, and archival), templating and localization , and reconciliation and reporting together with stakeholders
- 5Champion clean architecture , component reusability, and maintainable UI patterns using modern frameworks (e.g. React, Next.js, or similar)
- 6Drive experiment-driven innovation and uphold strong engineering practices in testing, CI/CD, observability, and code quality
- 7Continuously improve developer experience by reducing technical debt, automating workflows, and documenting key decisions and operational processes
- 8Operate effectively in an asynchronous, outcome-oriented environment , managing your work autonomously and maintaining clear communication through documentation and structured updates
- 9Contribute 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), including patterns for idempotent money movement and auditable billing events where relevant
- 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 for regulated or finance-adjacent flows
- Curiosity and initiative to explore new tools and methods that improve product quality and engineering efficiency
- Excellent written and spoken English (German is a plus)
- Residency in Germany
Perks & Benefits
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