Medior Java developer

Outtask Group; Amsterdam; Hybrid; EUR 60,000 - 80,000; Full time

Job summary

Outtask Group in Amsterdam is seeking a Medior Java Developer to join a compact development team and build reliable backend services in a modern microservices landscape. You will write code and contribute to design, testing, deployment and continuous improvement of critical applications.

You will develop and maintain microservices and REST APIs using Java 21 and Spring Boot, implement event-driven communication with Kafka and Azure Event Hub, and deploy on Kubernetes/AKS.

Qualifications

• Bachelor's or Master’s degree in a relevant field.
• Proven experience with Java and Spring Boot.
• Experience building REST APIs in a microservices environment.
• Familiarity with event-driven systems (Kafka, Azure Event Hub).
• Knowledge of Kubernetes/K8s and AKS is a plus.
• Understanding of distributed systems and design patterns (DDD, hexagonal).

Responsibilities

• Write code and develop backend services in a modern microservices landscape.
• Contribute to design, testing, deployment and continuous improvement of critical applications.
• Develop and maintain microservices and REST APIs using Java 21 and Spring Boot.
• Implement event-driven communication with Kafka and Azure Event Hub.
• Deploy and manage applications on Kubernetes/AKS.
• Create tests with Testcontainers, WireMock, Mockito and MockMvc.
• Apply hexagonal architecture, SOLID, and DDD.
• Contribute to IaC using Terraform.
• Collaborate with a small team to improve deployment and rollback strategies.

Skills

Java

Spring Boot

REST APIs

Kafka

Azure Event Hub

Kubernetes

AKS

Testcontainers

Mockito

WireMock

MockMvc

Terraform

DDD

Hexagonal architecture

SOLID principles

Dead-letter queues

Education

Bachelor's or Master's degree

Tools

Terraform

Job description

Our client is a leading organisation in the banking and financial services sector, supporting customers through a rapidly changing and increasingly sustainable economy. As a Medior Java Developer, you will help build reliable digital services that make financial experiences seamless and relevant. You will join a compact development team where communication is direct, your ideas are valued and you can take real ownership. The challenge is to develop robust, scalable services in a complex microservices environment while continuing to deepen your technical expertise.

What does the role involve?

You will primarily write code and develop dependable backend services within a modern microservices landscape. Working from the Amsterdam area in a hybrid setup, you will contribute to the design, testing, deployment and continuous improvement of critical applications.

You develop and maintain microservices and REST APIs using Java 21 and Spring Boot.

You implement event-driven communication between services using Azure Event Hub and Kafka.

You deploy and manage applications on Kubernetes, including Azure Kubernetes Service (AKS).

You write automated tests with Testcontainers, WireMock, Mockito and MockMvc, including Kafka-based tests.

You apply hexagonal architecture, SOLID principles and domain-driven design (DDD).

You contribute to infrastructure as code using Terraform.

You investigate issues involving communication, consistency, message ordering, retries, dead-letter queues and idempotency.

You contribute to monitoring, deployment and rollback strategies within a team of six to eight developers.

You share ideas, review solutions and take ownership of improvements from development through to deployment.

Who are we looking for?

You are a Medior Java Developer who enjoys hands-on engineering and is curious about how systems work beneath the surface. You work effectively on your own while actively collaborating with colleagues in a small team and contributing thoughtfully to technical decisions.

You have bachelor’s or master’s-level thinking and several years of experience as a Java Developer at medior level.

You have professional experience with Java, Spring Boot and building REST APIs.

You have an affinity with event-driven systems such as Kafka and Azure Event Hub, including topics such as dead-letter queues, message retries, ordering and idempotency.

You have knowledge of, or a genuine interest in, Kubernetes and AKS, microservices architecture, deployments and rollback strategies.

You are curious about technical details such as Kafka serialisation and understand the practical challenges of distributed systems.

You work independently, while deliberately seeking collaboration and sharing information within a small development team.

You already have the right to work in the Netherlands or the European Union; visa sponsorship is not available for this role.

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