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.

• Job title: Java Fullstack Engineer

• Available in 2 locations

• Full time

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 Java, and comfort working in a polyglot environment (Go, Kotlin).

• Domain Knowledge in AuthN & AuthZ: Hands-on experience with identity protocols (OAuth 2.0, OpenID Connect, SAML) and custom/open-source identity providers such as Keycloak.

• Frontend Capabilities: Nice to have hands-on proficiency or willing to work with React (JavaScript/TypeScript) to deliver modern, end-to-end full-stack solutions.

• Cloud & Container Experience: Experience operating services in production with Kubernetes (k8s), Docker, and AWS cloud services.

• SDK & Scripting Versatility: Familiarity or comfort working with .NET (for internal client SDK maintenance) and Python (for automation and tooling).

• AI-Assisted Development & SRE Mindset: Comfortable leveraging AI coding assistants to accelerate development, paired with an operational mindset focused on monitoring and reliability.

At JET, This Is On The Menu

Our teams forge connections internally and work with some of the best-known brands on the planet, giving us truly international impact in a dynamic environment.

Fun, fast-paced and supportive, the JET culture is about movement, growth and about celebrating every aspect of our JETers. Thanks to them we stay one step ahead of the competition.