Identity & Access Full-Stack Engineer (Java/React)

Vacant; Amsterdam; On-site; EUR 70,000 - 110,000; Full time

Job summary

Vacant is seeking a proactive software engineer to join our Identity & Access Management team as a Full-Stack Engineer. You will design, build, and scale enterprise authentication and authorization services, leveraging Java with Keycloak and microservices in Go/Kotlin, while delivering secure React-based admin interfaces.

You will work in a polyglot environment, supporting .NET SDKs and Python automation scripts, and deploying with Docker, Kubernetes, and AWS to ensure high availability and

Qualifications

• Commercial backend experience with strong Java focus in a polyglot environment (Go, Kotlin).
• Hands-on experience with identity protocols (OAuth 2.0, OpenID Connect, SAML) and Keycloak.
• Frontend capabilities with React (JS/TS) for end-to-end full-stack solutions.
• Cloud & container experience: Kubernetes, Docker, and AWS.
• SDKs and scripting: .NET and Python.
• AI-assisted development and SRE mindset for reliability and observability.

Responsibilities

• Build & scale Identity Services using Java and Keycloak; high-concurrency authorization microservices in Go/Kotlin.
• Deliver end-to-end features with React for admin dashboards and user identity journeys.
• Support polyglot ecosystems and tooling with .NET SDKs and Python automation scripts.
• Drive cloud infrastructure and reliability with Docker, Kubernetes and AWS.
• Elevate technical standards with modern security patterns (OAuth2, OIDC, RBAC/ABAC) and architectural reviews.

Skills

Java Backend

AuthN/AuthZ

React.js

Go

Kotlin

AWS

Docker

Kubernetes

Python

.NET

Tools

Keycloak

Java SDKs

Python scripting

Job description

Vacant is seeking a proactive software engineer to join our Identity & Access Management team as a Full-Stack Engineer. You will design, build, and scale enterprise authentication and authorization services, leveraging Java with Keycloak and microservices in Go/Kotlin, while delivering secure React-based admin interfaces.

You will work in a polyglot environment, supporting .NET SDKs and Python automation scripts, and deploying with Docker, Kubernetes, and AWS to ensure high availability and