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, testing quickly and iterating under a GitOps-driven mindset with CI/CD best practices. Identify usability, performance, or reliability improvements that make the portal experience smoother for external users. What we'd love to see in your background5+ years of experience as a Software Engineer working on backend systems or full-stack product development.

Solid experience designing and maintaining production-grade APIs and backend services.

Experience working with modern frontend frameworks such as React or similar technologies. Comfortable working in English and collaborating with distributed teams. Final coffee chat with an Engineering or Product leader to discuss Factorial's vision, culture, and your potential impact. All interviews are remote via video conferencing tools.

About us ðAt Factorial, we're building the leading business management software for companies of all sizes. Our platform centralizes key workflows across HR, finance, and operations, freeing teams from manual processes so they can focus on what really matters: leading, growing, and taking care of their people. With over 1,200 employees across 7 markets, we serve 700,000+ users and are one of Europe's fastest-growing SaaS companies, backed by top-tier investors and proudly headquartered in Barcelona.

Our Values ð«We own it: We take responsibility for every project. We're dedicated to learning something new every day and, above all, share it. High growth, multicultural and friendly environment ðAlan as private health insurance ðoHealthy life with Wellhub (Gyms, pools, outdoor classes) ð§ð1⁄2Save expenses with Cobee ðLanguage classes ðð1⁄2ð«Breakfast in the office and organic fruit ðNora discounts ðFree caffeine and theine Pet Friendly ð

📌 Senior Software Engineer (AWS) - Fully Remote (Barcelona)
🏢 Factorial Hr
📍 Barcelona