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 independently and propose efficient solutions.
- Collaborative, humble, and team-oriented mindset.
- Advanced level of English (written and spoken), with the ability to communicate effectively in an international environment.

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📌 Ruby on Rails Backend Developer (Madrid)
🏢 Teamsystem
📍 Madrid