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Senior Java Developer (m/f)

HybridBanking & Finance

ARHS GroupLuxembourgPosted on 2 octobre 2026IT services company · freelance status to confirmView the original ad on the company's website

≈ 550 – 800 €/jSign up to apply

About this mission

ARHS Group, part of Accenture, is looking for a Senior Java Developer to join one of our client teams in Luxembourg within the banking sector.

You will work on business-critical applications where software quality, performance, security, and reliability are key. Alongside hands-on Java development, you will contribute to the modernization of existing solutions, investigate complex technical issues, and help build a robust foundation for new projects.

Please note that fluency in French is mandatory for this position.

Responsibilities

  • Develop and maintain robust backend solutions using Java 17+ and the Spring ecosystem.
  • Contribute to application upgrades and technology modernization, addressing technical debt and obsolescence.
  • Investigate complex technical issues using logs and monitoring tools, perform root cause analysis, and improve application resilience.
  • Apply Security by Design principles, including authentication, authorization, secrets management, and data protection.
  • Identify and address application vulnerabilities, including OWASP-related risks and dependency vulnerabilities.
  • Improve application performance, code quality, error handling, and observability.
  • Contribute to modernization of existing services and the development of new solutions, ensuring smooth integration with web and mobile applications.
  • Maintain technical documentation and automate testing to support reliable and stable production releases.

Required profile

  • 5+ years of experience in Java development.
  • Strong hands-on experience with Java 17+, Spring Boot, and Spring Security.
  • Strong analytical and troubleshooting skills, including experience investigating logs and monitoring data to identify root causes.
  • Good knowledge of MS SQL.
  • Experience with OpenShift and GitLab CI.
  • Strong understanding of software testing, application security, and OWASP best practices.
  • Experience with observability tools and technologies such as OpenTelemetry and/or the ELK Stack.
  • Basic knowledge of Angular and an understanding of mobile environments such as iOS, Android, and Capacitor.
  • Strong focus on code quality, performance, reliability, and maintainability.
  • Fluency in French is mandatory.

BONUS POINTS IF YOU HAVE:

  • Experience working in the banking or financial services sector.
  • Experience with application modernization or large-scale technical upgrade projects.
  • Experience working with business-critical, high-availability applications.

Conditions

Onsite at client site: This role requires an onsite presence with our clients and partners to support project delivery and strengthen collaboration.

Our roles require in-person time to encourage collaboration, learning, and relationship-building with clients, colleagues, and communities. As an employer, we will be as flexible as possible to support your specific work/life needs.

Key information

LocationLuxembourg
RemoteHybrid
Estimated daily rate≈ 550 – 800 €/j
SectorBanking & Finance

Range estimated by our AI from the ad and the freelance rates published in Luxembourg: the company did not publish a rate. To be confirmed when you talk. This IT services company did not state the status; such companies usually accept freelancers. Apply in 1 click and we check with them.

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