Senior Developer – Ruby on Rails

everii Group

Senior Developer developing technical foundations of products at everii Group. Focus on Ruby on Rails and key service development for multiple products.

Posted 4/14/2026full-timeHamburg • 🇩🇪 GermanySeniorWebsite

Tech Stack

Tools & technologies

DockerGraphQLLinuxPostgresRubyRuby on RailsSQLSwitching

About the role

Key responsibilities & impact

Service development: Implementation and maintenance of core services that are used across all everii products.
Service encapsulation: Extracting functionality from individual products and providing it as standalone, reusable services.
AI & Innovation: Active use of AI tools and agents to support development processes.
Quality & Testing: Automated tests, code reviews and continuous improvement of code quality and developer experience.
APIs & Integrations: Development and further enhancement of REST and GraphQL APIs.
Operations & Monitoring: Responsibility for stable and secure services, including monitoring and troubleshooting across our CI/CD pipelines.
Technical design: Creating and implementing technical concepts as well as actively discussing architecture and solution approaches within the team.
Collaboration: Close collaboration within the development team.

Requirements

What you’ll need

Solid backend experience with Ruby on Rails (including Sidekiq)
Confident with Git and IDEs such as RubyMine and VS Code
Experience with PostgreSQL, MS SQL or other relational databases
Experience with REST and GraphQL APIs as well as API authentication (OAuth, JWT) and documentation (Swagger/OpenAPI)
Experience with Sidekiq (Ruby)
Knowledge of performance optimization and caching strategies
Comfortable and confident using AI tools and agents
Familiarity with automated testing as well as GitHub Actions, Docker and container-based deployments
Basic knowledge of Linux servers and container-based setups
Ideally, you have already contributed to a production SaaS product
Maintainable, well-thought-out code — no hacky fixes, but with healthy pragmatism
Enjoy discovering and trying out new technologies
Open-minded, team player, able to handle context switching
Clear communicator: give and solicit feedback, and conduct constructive discussions
Very good German and English, spoken and written

Benefits

Comp & perks

Individual development: Room for autonomous work, freedom to shape your role and continuous learning
Smart work: Modern technical equipment, hybrid working model and trust-based working hours
Feel-good atmosphere: Fresh fruit, coffee, chilled drinks and a weekly communal breakfast — located in the heart of Hamburg or Frankfurt
Tech stack & team: Modern tools and technologies in a product-focused team with short decision-making paths
Stability: Permanent full-time position, start possible immediately

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Ruby on RailsSidekiqPostgreSQLMS SQLREST APIsGraphQL APIsAPI authenticationautomated testingperformance optimizationcaching strategies

Soft Skills

team playerclear communicatoropen-mindedcontext switchingcollaboration