Senior Software Engineer - Ruby on Rails (f/m/d)

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About the role

Are you ready to change the market? At PAIR Finance we're building the AI-driven platform that's redefining debt collection across Europe. 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. Your Responsibilities: • Own a clear scope end-to-e nd: 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 • Help evolve  and enhance our AI-based platform • Stay current with industry trends and bring ideas back to the team What we're looking for: • 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 (hands-on experience with Go and/or Python is a big plus)  • 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 • Solid English communication skills 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 Our offer for you: • For this senior-level role, our salary band is €77,000 - €92,000 gross per year (based on a 40-hour work week). The exact offer will reflect your experience and qualifications • We offer visa sponsorship • Thriving, financially stable company • Strong experienced international team to support and mentor you along the way, smooth onboarding process • International team of 30+ nationalities with professionals and experts • Flat hierarchy, transparent and appreciative feedback culture, monthly all hands meetings, annual feedback and evaluation cycle, regular 1-on-1s with your lead • Well-structured onboarding process as well as supportive and welcoming colleagues • Personal learning & development budget as well as German and English language courses • Unlimited employment contract, flexible working hours and 28 vacation days for your work-life balance • Company pension plan, partly covered Deutschlandticket (public transport) and access to “Corporate Benefits”-voucher platform to ensure your full well-being • Fun company summer and Christmas parties as well as regular team events • This role is based in Berlin , and we have a hybrid working policy. Modern office near Uhlandstr. is complete with fresh fruit, muesli and drinks for a comfortable and enjoyable workplace Who is your contact person? Your c

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