Java Fullstack Engineer

Hungry for a challenge?

That’s good, because at Just Eat Takeaway.com (JET) we believe everything is possible, or, as we say, everything is on the table. We are a leading global online food delivery marketplace. Our tech ecosystem connects millions of active customers with hundreds of thousands of connected partners in countries across the globe.

Our mission? To empower every food moment around the world, whether it’s through customer service, coding, or couriers.

The Opportunity:

We are looking for a proactive software engineer with a strong backend foundation and full-stack capabilities to join our Identity & Access Management (AuthN/AuthZ) team. As a Full-Stack Engineer, you will bring solid experience in security architectures, identity systems, and distributed microservices to the table.

In this role, you will be instrumental in building high-throughput authorization services, extending enterprise authentication workflows, maintaining developer SDKs, and delivering intuitive frontend interfaces for our global ecosystem.

In this role you'll have the responsibility to:

• Build & Scale Identity Services: Design, develop, and maintain enterprise Authentication infrastructure built primarily on Java and Keycloak, alongside high-concurrency Authorization microservices in Go and Kotlin.
• Deliver End-to-End Features (React): Build clean, secure, and responsive frontend applications and admin dashboards using React to support seamlessly integrated user and partner identity journeys.
• Support Polyglot Ecosystems & Tooling: Support client-side .NET SDKs and write Python automation scripts to streamline developer onboarding, authorization checks, and ops automation across JET teams.
• Drive Cloud Infrastructure & Reliability: Package, deploy, and scale microservices using Docker, Kubernetes (k8s), and AWS, ensuring high availability, fault tolerance, and tight security controls.
• Elevate Technical Standards: Implement modern security patterns (OAuth2, OIDC, RBAC/ABAC), adhere to observability standards, and actively participate in collaborative architectural reviews and team knowledge sharing.

What Will You Bring to the Table?

• Solid Java Backend Experience: Commercial experience in backend engineering, with a strong primary focus on , and comfort working in a polyglot environment (Go, Kotlin).