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

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 contact person for this position is  Geneva Brooks . If you have any questions, please contact us directly by email ----- - we look forward to hearing from you!

For more information about PAIR Finance, please take a look at our website and our careers page .

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