Senior Ruby on Rails Developer

Location: Geneva (Hybrid)
Experience: 5+ years (Senior-level, with strong ownership expectations)
Language: English (C1+)
Contract: Full-time employee
Team: Backend (5 developers), working closely with Frontend and Product
Reports to: Tech Lead

We’re looking for an experienced, pragmatic Senior Ruby on Rails Developer to take long-term ownership of key backend systems across our e-commerce platform. You’ll play a central role in ensuring performance, scalability, and reliability as we continue to grow. From designing robust APIs to refining domain models and improving performance at scale, you’ll help strengthen the technical foundation of a product-driven business.

• API development: Design, implement, and maintain scalable REST APIs serving both internal and external clients

• Business logic & data modeling: Lead improvements to our domain models using Active Record and PostgreSQL

• Performance optimization: Improve query performance, background job efficiency (Sidekiq), and caching strategies (Redis)

• Architecture contribution: Actively contribute to system design discussions and long-term architectural decisions, in collaboration with the Tech Lead.

• Code quality: Write and maintain high-quality, well-tested code using RSpec, Rubo Cop, and Simple Cov

• Reliability & security: Apply secure coding practices and help strengthen our resilience, availability, and observability

• Cross-team collaboration: Work closely with product managers and frontend engineers to deliver features efficiently

• Knowledge sharing: Mentor team members and help raise the overall engineering bar

• Consistently fast, reliable APIs

• Predictable delivery of scoped tasks with low bug rates

• Measurable performance improvements across services and background jobs

• Strong collaboration and communication within the backend and cross-functional teams

• Contributions that increase system stability and reduce operational overhead

We run weekly check-ins and maintain a steady async communication flow.

• Backend: Ruby on Rails, Postgre
  
  SQL, Sidekiq, Redis, REST APIs

• Testing & Quality: RSpec, Rubo Cop, Simple Cov

• Infrastructure: Heroku, Docker, CircleCI

• Collaboration: Jira, Slack, Bitbucket, Figma

• Strong experience building and maintaining production Rails applications

• Solid knowledge of Postgre
  
  SQL, relational modeling, and performance tuning

• Experience with background job processing and caching layers

• A pragmatic mindset, balancing engineering quality with business needs

• Comfortable owning features end-to-end

• Clear communication and the ability to collaborate effectively in a remote environment

• You are comfortable operating with a high degree of autonomy and taking ownership of technical decisions within your scope, while aligning with the broader engineering direction.

• Full-time employment in a growing e-commerce company

• Opportunity to influence architecture and technical strategy

• Collaboration with an experienced, stable engineering team

• A product with meaningful scale and complexity

If this role interests you, please share your CV, Git Hub or portfolio, and a few relevant project examples.