Senior DevOps Engineer

Your role 💼

We are looking for an Application Migration & Modernisation Engineer to support a large-scale transformation initiative focused on migrating legacy ESB-based services into modern, cloud-native architectures.

This role is particularly suited for profiles with strong experience in integration and middleware modernisation, moving legacy systems toward Spring Boot microservices deployed on OpenShift.

Key Responsibilities includes:

1. Application Migration & Modernisation

Migrate services from Java 6–11, SwitchYard, Red Hat Fuse / EAP 6 to Java 25 and Spring Boot 4

Rewrite Camel/Fuse routes and SwitchYard services into standalone Spring Boot components

Containerise services and deploy them on OpenShift

Maintain and evolve REST and SOAP APIs

Ensure backward compatibility with existing systems

2. Messaging & Integration

Contribute to migration from ActiveMQ to Kafka

Ensure reliability during coexistence phases

Implement integration patterns:

Idempotence

Error handling

Dead-letter queues

Message ordering

At-least-once delivery

Document data flows and messaging contracts (Avro/JSON, topics, consumer groups)

3. DevOps, CI/CD & Deployment

Maintain and enhance GitLab CI/CD pipelines

Manage build, testing, containerisation and deployment processes

Apply GitOps practices with ArgoCD

Work with Docker, Helm, Kustomize and OpenShift

Contribute to Infrastructure as Code for environment reproducibility

4. Quality, Reliability & Observability

Ensure stability and performance of migrated services

Implement automated testing (unit, integration, non-regression)

Use tools such as JUnit 5, Testcontainers, WireMock

Implement monitoring and logging:

Prometheus

Micrometer

Grafana

ELK

OpenTelemetry

Provide Level 3 support

Produce documentation and runbooks

Soft Skills

Strong analytical and problem-solving skills

Ability to work in complex technical environments

Good communication and collaboration skills

Autonomous and solution-oriented mindset

Attention to quality and detail

Requirements 💡

• Degree in Computer Science, Software Engineering or related field
• Minimum 5 years of experience in Java development and system integration
• Strong experience with Java (11–25) and Spring Boot (2.x–4.x)
• Experience with REST and SOAP APIs
• Knowledge of Apache Camel, Red Hat Fuse, SwitchYard
• Experience with ActiveMQ/JMS and Kafka
• Strong DevOps knowledge:
• GitLab CI/CD
• Docker
• Kubernetes / OpenShift
• ArgoCD
• Helm / Kustomize
• Knowledge of: Clean Code; Automated testing; SonarQube; OWASP
• Nice to have: Kubernetes certifications (CKA / CKAD); Red Hat OpenShift certification (EX280)

📍 Where: Luxembourg, Full on-site presence in Luxembourg (5 days per week)

🌱 What We Offer

✨ A dynamic, young, and fast-growing environment

🔄 Flexible thinking and working approaches

🎓 Hands-on experience in a stimulating, project-based context

👩 🏫 Opportunities to learn from industry professionals

📚 On-the-job training (and more)

🚀 The chance to work on real projects with tangible impact

The chance to work on real projects with tangible impact

🌍 Inclusion & Equal Opportunity

We believe in people, diversity, and meritocracy. Our recruitment processes are open to everyone—regardless of gender, ethnicity, orientation, or ability. For us, talent is a matter of energy, not labels.

🔗 Discover more about us #BTO

Explore our world at 🌐 www.relatech.com