Senior Software Engineer - Ruby on Rails

We're looking for a senior software engineer who takes ownership end-to-end, is comfortable being the technical driver of a well-defined scope, and is energized by learning a deep, high-stakes domain: the legal processes around In-Court and After-Court debt collection.

What you'll do

• Own a clear scope end-to-end: take initiative from idea to production largely independently, and lead within your team (T-shaped: you go deep on your slice, and pair with one other developer)
• Design, build, and run POCs quickly to de-risk decisions before committing to a full build
• Develop, optimize, and maintain our core backend applications and services
• Work on high-level architecture to ensure scalability, performance, availability, and security
• Go deep on the In-Court/After-Court domain (the legal and procedural knowledge behind our collection processes is a core part of the job, not a side detail)
• Collaborate closely with product to shape the roadmap and unlock further company growth
• Work AI-augmented: you already use (or are ready to adopt) tools like Claude Code as part of how you build, review, and ship

What you'll need

• 5+ years of professional software engineering experience, including 1+ year on medium-to-large projects
• Strong backend experience in Ruby (Ruby on Rails): this is our core stack, and required for the role
• Language-agnostic mindset: you pick the right tool for the job
• Proven ability to work independently: scope, drive, and deliver a project with minimal hand-holding
• Experience with TDD and CI/CD
• A track record of writing clean, maintainable backend code and solid infrastructure
• Comfortable in an Agile environment (Scrum, Kanban)
• Genuine interest in working with, and building on top of, AI-based technologies

Nice to have

• Experience in the financial or accounting industry
• Frontend development experience, especially Vue.js and GraphQL knowledge
• Infrastructure experience: AWS, Terraform (IaC), Docker, Linux
• Knowledge of other backend technologies, such as Node.js, Rust, or Java

What they offer

• Unlimited employment contract with flexible working hours and 28 vacation days
• Personal learning & development budget and language courses
• Company pension plan and partly covered Deutschlandticket
• Visa sponsorship
• Hybrid work in Berlin with modern office near Uhlandstr.
• International team of 30+ nationalities with mentoring and support