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# Senior Software Engineer - Ruby on Rails

- **Company:** PAIR Finance
- **Location:** Berlin, Germany
- **Experience:** Expert
- **Salary:** €77,000 - €90,000
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Agile Methodology, Artificial Intelligence, Amazon Web Services, Continuous Integration, Linux, High-Level Architecture, Python (Programming Language), Node.Js, Scrum Methodology, Ruby on Rails, Ruby, Software Engineering, Claude Code, Backend, Vue.js, Graphql, Front End Software Development, Terraform, Docker
- **Published:** November 11, 2026
- **Apply:** https://www.adzuna.de/details/5886391004

## About the Role

* 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

## Description

* 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 domain (the legal and procedural knowledge behind our 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