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.

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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

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- 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

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- 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

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- Previous hands-on experience with Backstage, Spotify’s open-source developer portal framework. xqbhyrx

- 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

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- 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