Full-Stack Software Engineer Payments (m/f/d) Munich, Berlin or Hamburg

Full-Stack Software Engineer Payments (m/f/d) Munich, Berlin or Hamburg

Join to apply for the Full-Stack Software Engineer Payments (m/f/d) Munich, Berlin or Hamburg role at 1KOMMA5°

Role Overview

You will play a pivotal role in shaping the monetization of our renewable energy solutions by focusing on payment integrations and smart monetization of existing products. Your work will enable seamless, scalable, and international business growth, contributing to making renewable energy accessible and profitable for private homes and small businesses worldwide.

Team and Responsibilities

As a software engineer at 1KOMMA5°, you will join an established cross-functional team of engineers, product managers, and designers. You will help build a self-organized tech team responsible for developing, deploying, and maintaining solutions.

Key responsibilities include:

• Contributing your skills to a team of self-driven software engineers
• Extending and maintaining critical backend applications
• Shaping requirements from complex business problems
• Fostering a culture of experiment-driven innovation
• Improving developer experience by reducing tech debt, automating processes, and documenting decisions

Candidate Requirements

We require you to have:

• Experience with payment systems, transaction workflows, and secure processing
• Proven experience in writing maintainable, reusable, and testable code with backend or full-stack technologies
• Experience designing and maintaining RESTful APIs
• Performance measurement and improvement skills
• An agile, result-oriented mindset and team support passion
• Interest or experience in human-centered software development
• Excellent English skills; German is a plus
• Residency in Germany

Our Tech Stack

We use:

• NestJS/TypeScript or Ruby on Rails for backend, leveraging cloud run services and functions
• Next.js/TypeScript for frontend, Flutter for mobile
• Infrastructure as code, Google Cloud deployment, Datadog for observability
• Low-Code Platforms for third-party integrations

Additional Benefits and Culture

Join a dynamic, motivated team working on impactful projects that accelerate energy and mobility transition. Enjoy flat hierarchies, direct contact with leadership, learning opportunities, remote work across Germany, and tangible impact on a rapidly growing user base.