Senior Software Engineer; f​/m​/d

Senior Software Engineer (f/m/d) –
Ruby Berlin HR Consulting

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We are a boutique recruitment agency supporting fast‑growing tech companies. Currently we support a partner, a fast‑growing B2B SaaS company in the automotive industry (Berlin/Hamburg).

We are seeking a Senior Full‑Stack Engineer with deep Ruby on Rails experience to develop new features for the loyalty program while reducing workload on the current team. The role involves full‑stack development in Ruby on Rails on the backend and modern frontend technologies.

• Develop and enhance full‑stack features with a strong focus on Ruby on Rails
• Build new functionality for the customer loyalty program, including backend logic, API endpoints, and frontend components
• Improve performance, scalability, and reliability of existing systems
• Take ownership of complex tasks to help reduce pressure on the current engineering team
• Collaborate with product managers, designers and other engineers in a fast‑moving, agile environment
• Write clean, maintainable, well‑tested code and support continuous improvement
• Contribute to architectural discussions and propose meaningful improvements
• Ensure smooth integrations between backend services, APIs, and frontend interfaces

• 5+ years of professional software engineering experience
• Strong expertise in Ruby on Rails and the surrounding ecosystem
• Full‑stack experience, ideally with modern technology
• Experience designing and implementing APIs
• Solid understanding of database technologies (e.g., Postgres)
• Familiarity with cloud environments, CI/CD, and deployment workflows
• Ability to work across backend and frontend components with confidence
• Strong ownership mindset with the ability to take pressure off a busy engineering team
• Excellent problem‑solving skills and a preference for simple, logical solutions
• Clear communicator who collaborates well in an Agile/Scrum environment
• Thrives in a start‑up‑like culture with autonomy and responsibility
• Hybrid set up:
  Based either in Berlin or Hamburg

Mid‑Senior level

Full‑time

Technology, Information and Media

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