Application Development

Fujitsu is a leading ICT company 125.000 employees worldwide, more than 140 in Luxembourg, offering a full range of technology, solutions and services. This is an opportunity to join a strong organization within a young, dynamic and flexible work environment, with a real growth opportunities and immediately make an impact.

As a Senior Backend Java Engineer, your mission will be to design, implement and maintain robust backend services within a modern microservices architecture, while ensuring high quality, security and compliance with architectural standards.

• Designing and implementing RESTful microservices using Java (LTS) and Quarkus, in line with Twelve‑Factor App principles.

• Developing secure, scalable and resilient backend services handling complex business processes (registrations, VAT declarations, validations, workflows, batch processing, notifications and asynchronous treatments).

• Implementing backend components strictly based on functional specifications provided by business analysts (APIs, data models, business rules, validations and RFC 9457 error cases), while ensuring technical consistency and robustness.

• Collaborating closely with the internal architect to ensure full alignment with defined architectural guidelines, transversal standards (logging, auditing, error handling, security) and the progressive application refactoring roadmap.

• Building and maintaining inter‑system integrations, including internal APIs and external systems (e.g. SAP, MyGuichet), notably through SOAP service consumption and asynchronous messaging.

• Delivering high‑quality, production‑ready code by applying best practices, contributing actively to code reviews, and ensuring strong unit and integration test coverage.

Technical Skills

• Strong expertise in backend development with Java (17+) and Quarkus, including REST APIs (JAX‑RS, RESTEasy), OpenAPI 3, JSON‑B/JSON‑P and messaging systems such as RabbitMQ.

• Solid experience with microservices architecture, containerization (Docker) and Kubernetes/OpenShift environments, including configuration, monitoring, logging (Splunk) and CI/CD pipelines.

• Proven ability to work with complex data environments, including PostgreSQL and legacy DB2 z/OS, as well as integrating external systems via SOAP, messaging and asynchronous flows.

   

Soft Skills

• Strong analytical mindset with the ability to quickly understand complex business domains and translate requirements into clean, maintainable backend solutions.

• Clear communication and effective collaboration with architects, business analysts, tech leads and cross‑functional teams in a demanding technical environment.

• High level of rigor, autonomy and reliability, with the ability to adapt to an evolving context combining legacy systems and modern microservices.

Innovation at the Service of Sustainable Transformation

Fujitsu is one of the world's leading information and communication technology (ICT) companies, specializing in IT solutions, digital transformation services, artificial intelligence, cybersecurity, and cloud computing.

With 125,000 employees across more than 100 countries, Fujitsu helps business drive innovation and performance. By leveraging our expertise and the power of ICT, we work hand in hand with our customers to shape a more sustainable future.

In Luxembourg, Fujitsu is a key player in digital transformation. With a disruptive and forward-thinking approach, Fujitsu Luxembourg supports businesses in their digital journey, contributing to a more sustainable world and a society built on trust through innovation.

Join Fujitsu and be part of tomorrow’s digital transformation! Discover our opportunities and become part of a team that shapes the future with passion and expertise.

In accordance with the provisions of the Luxembourg law of 23 July 2016 amending the law of 29 March 2013, candidates may be required to provide an extract from their criminal record. This document, issued by the authorities, must not be older than three months.

Such a document will be requested with the aim of carrying out a character check on candidates, bearing in mind the area of activity of our establishment and, more particularly, the tasks described in the job description.