Senior Backend Developer (Ruby on Rails)

Madrid, A Coruña, Salamanca, Barcelona, Ciudad Real | Hybrid Model | Full-time | Permanent Contract At TeamSystem | Quipu, we help thousands of freelancers, SMEs, and accounting firms across Spain manage their businesses simply and efficiently through an intuitive and reliable SaaS platform. Since October 2025, Quipu has been part of TeamSystem, a leading international business software group, enabling us to continue innovating and scale our product with a long-term vision.
Your Mission

We are looking for a Senior Backend Developer (Ruby on Rails) to help us continue evolving our SaaS product. You will join a highly skilled Product and Technology team, actively contributing to the development of new features and the continuous improvement of a platform used by thousands of customers every day. Your work will have a direct impact on the quality, scalability, and future evolution of the product.
Technology Stack

Backend Ruby on Rails
Elasticsearch
Sidekiq
Redis
MySQL
REST APIs
Frontend JavaScript (ES6+)
React
React Native
Infrastructure AWS




Nginx
Capistrano
Ansible
Terraform
What Will You Do?

Improve and maintain the existing SaaS product while developing valuable new features.
Build backend solutions using Ruby on Rails and related technologies.
Participate in the full Agile development lifecycle, including refinement, estimation, technical analysis, and delivery.
Collaborate closely with the Product Owner and the development team.
Work cross-functionally with Sales, Marketing, and Customer Success teams.
Contribute your expertise to discuss and define technical approaches and solutions.
Take ownership of your developments end-to-end, ensuring quality standards and best practices are followed.
What We’re Looking For

Strong experience as a Backend Developer with Ruby on Rails.
Solid understanding of designing and consuming REST APIs.
Focus on code quality, testing, and software development best practices.
Ability to work i

📌 Ruby on Rails Backend Developer (Madrid)
🏢 QUIPU APP
📍 Madrid