Senior Java Developer (m/f)

Location: Luxembourg; onsite presence at the client site is required

Company

Arηs Group, part of Accenture, delivers complex public-sector IT projects covering systems integration, analytics, software development, security, cloud, machine learning, and mobile development.

What you will do

• Develop and maintain robust backend solutions using Java 17+ and the Spring ecosystem.
• Modernize existing applications, address technical debt and obsolescence, and contribute to new solutions.
• Investigate complex technical issues through logs and monitoring, perform root-cause analysis, and improve application resilience.
• Apply Security by Design, including authentication, authorization, secrets management, data protection, and OWASP vulnerability mitigation.
• Improve performance, code quality, error handling, observability, and integration with web and mobile applications.
• Maintain technical documentation and automate testing to support reliable production releases.

Requirements

• 5+ years of Java development experience.
• Strong hands-on experience with Java 17+, Spring Boot, and Spring Security.
• Experience with MS SQL, OpenShift, and GitLab CI.
• Knowledge of software testing, application security, OWASP practices, and observability technologies such as OpenTelemetry or the ELK Stack.
• Basic knowledge of Angular and mobile environments including iOS, Android, and Capacitor.
• Fluency in French is mandatory.

Nice to have

• Experience in banking or financial services.
• Experience with application modernization or large-scale technology upgrades.
• Experience with business-critical, high-availability applications.

Culture & Benefits

• Full-time employment within a client team in the banking sector.
• Onsite collaboration with clients and partners is required.
• In-person work supports collaboration, learning, and relationship-building.
• Work-life needs are supported with flexibility where possible.