ð We're hiring Fullstack engineer with a product mindset who loves building scalable systems and polished user experiences. We're creating a platform where customers can manage subscriptions, billing, invoices, payment methods, and usage insights through seamless self-service experiences built on a modular, scalable architecture with best-in-class service design.
As a Fullstack engineer in the Portals team, you'll build and evolve customer facing portals that enable secure, intuitive, and scalable self-service experiences.
You'll design and integrate systems that connect internal platforms—billing, CRM, product services, and support—with external users, ensuring reliable access to key workflows across the customer lifecycle.
Your work will directly impact how customers and partners interact with Factorial, improving transparency, reducing operational friction, and enabling scalable growth through self-service.
You'll collaborate closely with Product, Design, Finance, Sales, and Support teams to translate business needs into intuitive, scalable, and secure user experiences.




You'll build robust backend services and APIs that power portal workflows while maintaining clean integrations with internal systems such as CRM, billing, and product platforms.
You'll take ownership of features end-to-end—from architecture and implementation to production monitoring, performance optimization, and continuous improvement.
Our stack & the day-to-day ð§ð»We standarize on Ruby on Rails and React / React Native, but we don't box ourselves in. You'll design scalable and intuitive user experiences, working closely with Product and Design to ensure portals are simple, reliable, and performant.
You'll integrate external and internal systems such as billing providers, CRM platforms, authentication services, and product APIs.
You'll implement monitoring, observability, and performance improvements to ensure reliability and a seamless user experience.
You'll work in short development cycles,

📌 Senior Software Engineer (Barcelona)
🏢 Factorial Hr
📍 Barcelona