Java Fullstack Engineer – IAM & Security Microservices

Just Eat Takeaway.com; Amsterdam; On-site; EUR 70,000 - 120,000; Full time

Job summary

Just Eat Takeaway.com in Amsterdam is seeking a proactive Full-Stack Engineer for our Identity & Access Management team. You will blend backend security with frontend work to support extensive identity journeys across our global platform.

You'll build scalable auth services with Java, Go, Kotlin, and Keycloak, deliver React UIs, and enable client SDKs in .NET and Python, while upholding high standards for security and reliability.

Qualifications

• Strong commercial experience in Java backend development in a polyglot environment.
• Hands-on authN/authZ knowledge with OAuth2, OpenID Connect, SAML and Keycloak.
• Frontend capabilities with React (JavaScript/TypeScript) to deliver full-stack solutions.
• Cloud & container expertise with Kubernetes, Docker and AWS.
• Familiarity with .NET and Python for SDKs and automation.
• Interest in AI-assisted development and an SRE mindset.

Responsibilities

• 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 cloud services, 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 participate in architectural reviews.

Skills

Java

Go

Kotlin

React

OAuth2

OIDC

ABAC/RBAC

Python

.NET

Tools

Keycloak

Docker

Kubernetes

AWS

Job description

Just Eat Takeaway.com in Amsterdam is seeking a proactive Full-Stack Engineer for our Identity & Access Management team. You will blend backend security with frontend work to support extensive identity journeys across our global platform.

You'll build scalable auth services with Java, Go, Kotlin, and Keycloak, deliver React UIs, and enable client SDKs in .NET and Python, while upholding high standards for security and reliability.