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.

Role Overview

As a Senior Ruby on Rails Developer, you’ll join our core backend team and contribute to the design, evolution, and maintenance of our platform’s services. The role is focused on delivering scalable, clean, and maintainable backend systems, supporting both customer-facing features and internal operations.

Your Responsibilities

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 ActiveRecord 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, RuboCop, and SimpleCov

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

What Success Looks Like

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.

Our Stack & Tools

Backend : Ruby on Rails, PostgreSQL, Sidekiq, Redis, REST APIs

Testing & Quality : RSpec, RuboCop, SimpleCov

Infrastructure : Heroku, Docker, CircleCI

Collaboration : Jira, Slack, Bitbucket, Figma

Who We’re Looking For

Strong experience building and maintaining production Rails applications

Solid knowledge of PostgreSQL, 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.

What We Offer

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

Next Steps

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