We are looking for a Frontend / Platform Engineer 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 not a traditional frontend role. You will work at the intersection of Frontend Engineering, Developer Experience and Platform Engineering, building React-based experiences, Backstage plugins and integrations that make it easier for engineering teams to discover, onboard and interact with platform services.

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

- Frontend: React, TypeScript, JavaScript
- Backend / Integration: Node.js, Express
- 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
- Runtime & Containers: Kubernetes
- 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

- Strong hands-on experience with TypeScript and JavaScript
- 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.

Apply now or reach out for more details!

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📌 Frontend / Platform Engineer – React and TypeScript (Madrid)
🏢 Infoser New Technologies
📍 Madrid