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(Senior) Full-Stack Software Engineer - Payments (m/f/d)
1Komma5Grad —Berlin
- Vollzeit
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Senior Fullstack Engineer (m/w/d) – Digital Front Office (DiFO) Platform
msg systems ag —Berlin
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(Senior) Full-Stack Software Engineer - Payments (m/f/d)
1Komma5° GmbH —Berlin
- Vollzeit
- JavaScript
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Senior Fullstack Engineer (m/w/d) – Digital Front Office (DiFO) Platform
msg systems ag —Berlin
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(Senior) Full-Stack Software Engineer - Payments (m/f/d)

1Komma5Grad -
Berlin

Jetzt bewerben

Details zur Stelle

Festanstellung | Vollzeit

Leistungen

Firmenfahrrad-Leasing

Qualifikationen

CI/CD
Datenmodellierung
React
JavaScript
PostgreSQL
REST
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 will architect the financial engines that power the global energy transition at scale. By building robust payment lifecycles and seamless checkout experiences, you’ll ensure that adopting sustainable energy is as friction-less as it is impactful. You aren’t just processing transactions; you’re building the trust and infrastructure required to move billions into renewable technology.
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 writing great code, 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 to performant, user-friendly frontends
Translate complex and loosely defined business problems into clear, actionable technical solutions
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 for backend applications
Postgres, Auth0, OpenAPI
Infrastructure as code
Deployment to Google Cloud/Vercel
Observability with Datadog

Dein Profil

You have:

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)
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
Curiosity and initiative to explore new tools and methods that improve product quality and engineering efficiency
Excellent written and spoken English
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 the best chances of 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.

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

Senior Fullstack Engineer (m/w/d) – Digital Front Office (DiFO) Platform

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

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