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Software Engineer - Financial Infrastructure & Payments (m/f/d)
1Komma5Grad —Home Office
- Vollzeit
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1 Tag
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Software Engineer - Financial Infrastructure & Payments (m/f/d)

1Komma5Grad -
Home Office

Jetzt bewerben

Details zur Stelle

Festanstellung | Vollzeit
vor 1 Tag

Leistungen

Firmenfahrrad-Leasing

Qualifikationen

CI/CD
Datenmodellierung
React
Google Cloud Platform
JavaScript
PostgreSQL
REST
APIs
GraphQL
TypeScript

Vollständige Stellenbeschreibung

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 particularly cost-effective. By 2030, our goal is to transition 1.5 million households to renewable energies. Over 3,000 people are working towards this every day, at more than 80 locations worldwide, from Finland to Australia.

Want to take responsibility and build solutions that truly matter? Apply now and help us shape the energy world of tomorrow.

Learn more about our Product & Tech team!

Deine Position

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

Dein Profil

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

Benefits

You are part of an international, dynamic, and highly motivated team of people who have proven to make things happen
With your work, you accelerate the "energy transition" and hence have a direct impact on our climate
Work with and learn from other super-smart colleagues
You will enjoy direct contact with core decision-makers
You will enjoy entering full-time in one of Europe’s most thriving scaleups
You 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
Whether city bike or e-bike - be flexible with our job bike leasing and do something good for the environment at the same time

Über uns

Die 1KOMMA5° Gruppe ist ein CleanTech Unicorn mit der Mission alles zu elektrifizieren und über unsere KI-basierte Software Plattform Heartbeat AI jeden an den Strommarkt der Zukunft anzuschließen. Wir sind das marktführende Unternehmen für die Installation von CO2-neutralen Energiesystemen, insbesondere bei Photovoltaik, Energiespeicher, Wallbox, Wärmepumpe und Energiemanagement. 1KOMMA5° vereint die besten Unternehmen Deutschlands, Europas und darüber hinaus – wir wachsen weiter und das weltweit.

Jetzt bewerben

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java developer Jobs in home office

Software Engineer - Financial Infrastructure & Payments (m/f/d)

Senior Software Engineer - JVM Language Clients

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