Lead Java Developer
Published on 28/07/2026
Kepler Search
Working time
Type of contract
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Lead Java Developer
Luxembourg
On-site
Contract
One of our clients in Luxembourg is searching for a Senior Java Developer to join them on an exciting project focused on the evolution and modernisation of a business-critical software platform.
The Senior Java Developer will work closely with cross-functional teams to enhance the reliability, security, and performance of existing applications while contributing to the delivery of new features and modernisation initiatives across web and mobile environments.
Required Tasks;
- Contributing to application reliability through version upgrades, troubleshooting, and obsolescence management.
- Analysing logs and monitoring data to diagnose complex technical issues and perform root cause analysis.
- Implementing security best practices, including authentication, authorisation, secret management, and vulnerability remediation.
- Improving application performance, code quality, telemetry, and error handling.
- Providing technical expertise during redesign and modernisation projects.
- Supporting secure and stable production deployments through technical documentation and test automation.
Required previous skills;
- Minimum of 5 years' experience as a Java Developer.
- Strong knowledge of Java (17+) and the Spring ecosystem (Spring Boot and Spring Security).
- Experience with root cause analysis and application monitoring tools.
- Knowledge of frontend technologies such as Angular and an understanding of mobile environments (iOS, Android and Capacitor).
- Proficiency with MS SQL databases.
- Experience with observability tools such as OpenTelemetry and/or the ELK stack.
- Experience working with OpenShift and GitLab CI.
- Strong understanding of secure development practices and OWASP standards.
Please note that this position requires regular onsite presence in Luxembourg.