Medior Backend Developer

Alium; Rotterdam; On-site; EUR 55,000 - 80,000; Full time

Job summary

Alium is seeking a Medior Backend Developer to bolster our Harbour Master’s PCM development team and modernise HaMIS, a mission-critical system supporting operational processes.

You will develop new functionality using Spring Boot, Java and Kotlin, build REST/SOAP integrations, and work with microservices, automated testing and clean architecture. Strong Dutch is needed, with on-call rotation after training.

Qualifications

• 3+ years of backend development experience with Java/Kotlin & Spring Boot.
• 3+ years with microservices, system integrations, testing and production troubleshooting.
• Strong communication and a proactive, collaborative attitude.
• Good command of Dutch.
• Willingness to participate in an on-call rotation after training.
• Experience with Kubernetes, CI/CD, GitLab, ActiveMQ, Grafana, Prometheus, ELK/OpenSearch, OpenTelemetry or 24/7 mission-critical environments is a strong plus.

Responsibilities

• Develop new functionality using Spring Boot, Java and Kotlin.
• Build and optimise REST/SOAP integrations, messaging and event-driven architectures.
• Work with microservices, automated testing and clean architecture.
• Improve logging, monitoring, tracing and alerting.
• Analyse and resolve production incidents and disruptions.
• Contribute to technical solutions, innovation and continuous improvement.
• Collaborate with developers, business consultants, testers and external stakeholders.

Skills

Java/Kotlin & Spring Boot

Microservices

Production troubleshooting

Communication skills

Dutch language

On-call readiness

Tools

Kubernetes

CI/CD

GitLab

ActiveMQ

Grafana

Prometheus

ELK/OpenSearch

OpenTelemetry

Job description

We’re Hiring: Medior Backend Developer – Java/Kotlin & Spring Boot

Are you an experienced backend developer who enjoys building reliable, secure and future-proof integrations? Do you thrive in a collaborative environment where technical expertise and a proactive mindset are equally valued?

For our PCM development team, we’re looking for a Medior Backend Developer to help develop and modernise HaMIS, a mission-critical system supporting the operational processes of the Harbour Master’s organisation.

What you’ll do

• Develop new functionality using Spring Boot, Java and Kotlin
• Build and optimise REST/SOAP integrations, messaging and event-driven architectures
• Work with microservices, automated testing and clean architecture
• Improve logging, monitoring, tracing and alerting
• Analyse and resolve production incidents and disruptions
• Contribute to technical solutions, innovation and continuous improvement
• Collaborate with developers, business consultants, testers and external stakeholders

What we’re looking for

• 3+ years of backend development experience with Java/Kotlin & Spring Boot
• 3+ years of experience with microservices, system integrations, testing and production troubleshooting
• Strong communication skills and a proactive, collaborative attitude
• Good command of Dutch
• Willingness to participate in an on-call rotation after training
• Experience with Kubernetes, CI/CD, GitLab, ActiveMQ, Grafana, Prometheus, ELK/OpenSearch, OpenTelemetry, API lifecycle management or 24/7 mission-critical environments is a strong plus.

If you’re a hands‑on backend developer who likes solving complex integration challenges while helping a team grow, we’d love to hear from you!