Senior Fullstack Software Engineer - Ruby/ Typescript (m/f/d)

1KOMMA5° is a CleanTech company focused on creating a sustainable energy system through innovative software solutions. The Senior Fullstack Software Engineer will develop and maintain the core business software platform, leading complex projects and ensuring integration between systems to facilitate the energy transition for private homes and small businesses.

Responsibilities:

• Core Development: Develop and maintain the core Rails application with a focus on code health, modern patterns, and long-term stability
• ShapeUp Leadership: Lead technical implementation for complex projects within 6-week cycles, taking ownership from architectural design to shipping
• System Integration: Build pragmatic connections between the Rails monolith and satellite TypeScript/GCP services (Pub/Sub, Cloud Functions) without over-engineering
• Developer Experience: Proactively identify and resolve friction in tooling, CI/CD, and local environments to ensure the codebase remains enjoyable to work in
• Technical Standards: Drive high-quality async collaboration through clear documentation, architectural decision records (ADRs or RFCs), and comprehensive code reviews

Requirements:

• proven experience in writing maintainable, self-describing, reusable and testable code with Rails and other major back-end or full-stack technologies in several past projects
• experience designing and maintaining RESTful APIs
• experience with measuring and improving performance
• an agile and result-oriented mindset and a passion to support your team colleagues
• interest or experience in human-centered software development
• excellent knowledge of spoken and written English
• residency in Germany
• German is a plus