Fullstack Software Engineer - Ruby/ Typescript

About the role

You'll be a senior software engineer developing 1KOMMA5°'s core business platform that streamlines renewable energy installations for homes and businesses worldwide. Working in a cross-functional team, you'll help build scalable solutions that integrate solar, batteries, heat pumps, and e-mobility into an intelligent energy system.

What you'll do

• Develop and maintain the core Rails application with focus on code health, modern patterns, and long-term stability
• Lead technical implementation for complex projects within 6-week ShapeUp cycles, owning architectural design through shipping
• Build pragmatic connections between Rails monolith and satellite TypeScript/GCP services
• Proactively identify and resolve friction in tooling, CI/CD, and local development environments
• Drive high-quality async collaboration through clear documentation, ADRs/RFCs, and comprehensive code reviews

What you'll need

• Proven experience writing maintainable, testable code with Rails and other major back-end or full-stack technologies
• Experience designing and maintaining RESTful APIs
• Experience with measuring and improving performance
• Agile and result-oriented mindset with passion for supporting team colleagues
• Excellent knowledge of spoken and written English
• Residency in Germany

Nice to have

• Interest or experience in human-centered software development
• German language skills

What they offer

• Remote work across Germany with offices in Hamburg, Berlin, or Munich
• Direct impact on climate change through energy transition work
• EGYM Wellpass for health and wellness benefits
• Futurebens benefits and discounts platform
• Job bike leasing for city bikes or e-bikes
• Direct contact with core decision-makers in a thriving European scaleup