Freelance Senior Java Backend Engineer opdracht

Senior Java Engineer
Help build reliable, real-time data products that contribute to safer, more accessible and more sustainable travel in the Netherlands. As a Senior Java Engineer, you’ll develop robust, scalable backend services that process millions of traffic messages a day.

What you’ll do
Develop and maintain backend services and microservices using Java and Spring Boot.
Build event-driven solutions to process real-time traffic data with Kafka.
Develop functionality to process, enrich and distribute data.
Contribute to an Angular frontend application that visualises data streams.
Build scalable, maintainable and testable software solutions.
Work with your team on CI/CD, monitoring and platform improvements.
Maintain and improve software quality and technical standards.
Contribute to architecture, technical innovation and process optimisation.
Develop your knowledge of streaming data, data modelling and distributed systems.

Technology
Java 21+ and Spring Boot 3 and 4
Event-driven architecture with Strimzi Kafka, Kafka Streams, Kafka Connect and RabbitMQ
Avro and PostgreSQL
Grafana, Prometheus, Loki, Tempo and OpenTelemetry
Kubernetes on Azure AKS
Angular

What you bring
A completed relevant university degree, such as Computer Science or Software Engineering.
At least five years of production experience with Java and Spring Boot within the past ten years.
At least two years of hands-on experience with event-driven architectures using Apache Kafka and Kafka Streams within the past five years.
Experience working in Kubernetes environments; experience with AKS is an advantage.
A strong focus on clean code, testability and scalability.
The technical depth and perspective to understand complex systems and act as a sparring partner for your team.
Experience with or an interest in Angular.
Experience with Azure DevOps pipelines and ArgoCD.
Experience working in an Agile environment; SAFe experience is an advantage.

How you work
You combine technical expertise with a pragmatic approach, knowing when to pursue perfection and when a simpler solution is better.
You think in systems and end-to-end data flows, not just individual components.
You enjoy sharing your knowledge and helping your colleagues grow.
You bring a positive attitude and a good sense of humour.
You value quality and simplicity, and avoid unnecessary complexity.
You thrive in an environment that combines freedom with responsibility.

What makes this role distinctive
Your work supports data products that contribute to traffic safety and sustainability in the Netherlands.
You’ll play a key role in a multidisciplinary team, with the opportunity to make a direct impact through your technical decisions.
You’ll work with a modern event-driven technology stack and real-time data at national scale.
You’ll have room to experiment with new tools, frameworks and methods, and help improve how the team works.