You architect the
billing,
invoicing, and
monetization systems behind the global energy transition, one unified internal platform. By designing and running everything from invoicing and subscriptions to PSP-backed payments and reconciliation, you make sustainable energy financially solid and operationally scalable. The audit trails, templates, and integrations you build are what finance teams and customers trust as we grow across markets.
As a
Software Engineer at
1KOMMA5°, you will take technical ownership of key systems and features, driving architectural decisions and ensuring scalability, reliability, and performance. You’ll collaborate closely with other engineers, product managers, and stakeholders to shape our technical direction and deliver high-impact solutions. Beyond building solution, you’ll mentor teammates, champion engineering excellence, and help evolve our development and deployment practices to the next level.
Key responsibilities include but are not limited to:
-
Contribute as a Full-stack engineer within a team of self-driven software developers
-
Design, 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
-
Partner 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
-
Own slices of the invoice lifecycle (generation, delivery, and archival), templating and localization, and reconciliation and reporting together with stakeholders
-
Champion clean architecture, component reusability, and maintainable UI patterns using modern frameworks (e.g. React, Next.js, or similar)
-
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 your work autonomously and maintaining clear communication through documentation and structured updates
-
Contribute to lightweight project management by defining milestones, ensuring technical feasibility, and aligning engineering work with product goals
Our Stack:
-
TypeScript / JavaScript
-
Next.js for frontend applications
-
NestJS and Hono for backend applications and APIs
-
Postgres, Auth0, OpenAPI
-
Infrastructure as code
-
Deployment to Google Cloud/Vercel
-
Observability with Datadog
