Sr Backend Engineer - GraphQL Federation
On-site · Dublin, Leinster, Ireland
Job Summary
Senior Backend Engineer to architect and evolve eBay’s GraphQL Federation platform. You’ll design high-performance federated architectures using Apollo Federation and WunderGraph, scale platform infrastructure, and drive query optimization, caching strategies, and resilient schema composition at global scale. You will implement security patterns (AuthN/AuthZ), rate limiting, and observability across the federation layer, and provide technical leadership with a Platform-as-a-Product mindset. The role requires expertise in Java (Spring Boot) and Node.js, comfort switching between JVM services and JavaScript environments, experience with microservices and distributed systems, and hands-on cloud-native practices with Kubernetes and CI/CD (Jenkins/Maven). You’ll help teams decide REST versus GraphQL trade-offs and deliver a world-class developer experience for internal teams and partners.
Required Qualifications
- 6+ years backend engineering experience
- proficiency with GraphQL Federation in production environments
- Java (Spring Boot) and Node.js
- microservices and distributed systems
- data modeling
- multithreading and asynchronous processing
- Kubernetes
- CI/CD (Jenkins/Maven) and cloud-native deployment patterns
- SOLID principles
- ability to weigh REST vs GraphQL trade-offs
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