We are looking for a Full Stack Developer (React and Express) to help build and evolve an enterprise Developer Portal, designed to provide development teams with a single, scalable entry point to tools, services and engineering capabilities.
This is a full stack role focused on building an enterprise Developer Portal with Spotify Backstage. You will develop React-based experiences, Backstage plugins and backend integrations that help engineering teams discover platform services, get started quickly and use the tools they need.
A key part of the role will be automating developer onboarding and platform synchronization, including detecting changes in GitHub and automatically reflecting them within the Developer Portal.
What you'll work with
Developer Portal: Backstage
Developer Ecosystem: GitHub and engineering tooling
APIs & Integration: REST APIs, asynchronous processing and external system integrations
Automation: GitHub-driven workflows and automated platform synchronization
Cloud: AWS, including AWS Lambda
Architecture: Enterprise portal architecture, scalability and reusable components
UX: Reusable UI components and developer-centric experiences
Ways of working: Agile (Scrum / Kanban), cross-functional and international teams
What you'll do
Design, develop and evolve React and TypeScript-based components for an enterprise Developer Portal
Build and maintain Backstage plugins to integrate internal and external engineering systems
Develop backend and integration capabilities using TypeScript, Node.Js and Express
Build automation that detects changes in GitHub and automatically synchronizes relevant information with the Developer Portal
Develop REST API integrations and asynchronous data-processing workflows
Create tools that simplify the onboarding of development teams and reduce friction when adopting the platform
Collaborate with UX specialists to design intuitive and reusable developer experiences




Contribute to architectural decisions around scalability, maintainability and platform evolution
Integrate cloud-native services running on AWS and Kubernetes
Collaborate with engineering teams and stakeholders across different organizational areas
Participate actively in technical discussions, code reviews and Agile ceremonies
What we're looking for
Previous hands-on experience with Backstage, Spotify’s open-source developer portal framework.
Solid professional experience developing applications with React
Experience with Node.Js / Express
Strong experience designing and consuming REST APIs
Experience with asynchronous data processing and system integrations
Good understanding of UI/UX principles and reusable component design
Experience working with GitHub and modern software development workflows
Good understanding of system and process architectures
Experience working in complex enterprise IT environments
Ability to work autonomously while collaborating effectively with international and cross-functional teams
Strong communication and problem-solving skills
Experience working with Agile methodologies (Scrum / Kanban)
What makes you stand out
Experience developing Backstage plugins or working with similar Internal Developer Portals
Experience with Developer Experience (DevEx) or Platform Engineering initiatives
Experience building GitHub integrations, webhooks or event-driven automations
Experience with AWS, particularly AWS Lambda
Experience deploying or operating applications on Kubernetes
Experience integrating developer ecosystems such as source control, CI/CD, observability, compliance or AI tooling
Understanding of Internal Developer Platforms (IDP), developer self-service or automated onboarding
If you are passionate about React and TypeScript but want to go beyond traditional frontend development, building tools and platforms that improve how other engineers work, we want to hear from you.
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📌 Full Stack Developer (Spotify Backstage, React & Express) (Madrid)
🏢 Infoser Technological Solutions, Hardware, Big Data Experts
📍 Madrid