For our client near Amsterdam we are looking for a Senior Java/Kotlin Developer

Freelancers not allowed

Must have requirements:

7+ years in Java/Kotlin development, with knowledge about Spring Boot, and event-driven architecture with tools such as Kafka.

Strong understanding of asynchronous communication patterns (Kafka, RabbitMQ, or similar message queues).

Proven experience in drafting and refining user stories and translating business requirements into technical solutions.

Understanding of Rest api architecture principles

Experience with microservice based architecture.

Familiar with observability best practices and hands-on experience in monitoring, logging, and alerting.

knowledge of PostgreSql, MongoDb, or similar

knowledge and understanding of writing unit/integration tests using frameworks like JUnit, Mockk, Mockito, etc.

Nice to have requirements:

Experience working with high-volume, business-critical systems that must remain resilient under heavy load.

Familiarity with designing-for-failure patterns (idempotency, retries, fallbacks, circuit breakers) to ensure reliability when issues have real-world impact.

Experience in contract-first REST Api development using OpenAPI

Experience with debugging across a distributed microservice system. 

Understanding of performance tests and writing performance tests using gatling (kotlin)

Some experience of running and debugging services in Kubernetes