Senior Java Software Engineer

One of our clients in Luxembourg is searching for a Senior Java Developer to join their team and support the evolution and modernisation of their partner connectivity applications.The Senior Java Developer will play a key role in maintaining and improving the technical foundations of existing applications while contributing to new projects. This is a cross-functional role requiring strong technical expertise in software quality, performance, security, and resilience.Required Tasks;Analysing incidents and resolving complex bugs through log analysis, monitoring tools, and root cause analysis.Managing version upgrades and obsolescence-related activities autonomously while effectively prioritising tasks.Identifying opportunities to improve application architecture, performance, and observability.Implementing security best practices throughout the software development lifecycle, including Security by Design principles and vulnerability management.Contributing technical expertise to modernisation and redesign initiatives, ensuring seamless integration with web and mobile interfaces.Producing technical documentation and supporting test automation to ensure smooth and reliable production deployments.Required previous skills;Minimum of 3 years' experience in Java development.Strong knowledge of Java (17+) and the Spring ecosystem (Spring Boot and Spring Security).Excellent analytical skills with the ability to assess code quality, architecture, and operational risks.Strong attention to detail, with a focus on clean code, error handling, and test coverage.Fluency in both French and English (written and spoken) is mandatory.Proficiency with MS SQL databases and observability tools such as OpenTelemetry and/or the ELK stack.Experience working with OpenShift and GitLab CI within a DevOps environment.Please note that this position requires regular onsite presence in Luxembourg.