Java API developer (Information Technology/Software)

Our client, a leading Software, Information and Communication Technologies company, operates internationally (Athens, Brussels, Luxembourg, Copenhagen, Stockholm, London, Nicosia, Hong-Kong, Valetta, etc). Our client is a renowned supplier of IT services to government institutions, multinational corporations, public administrations and multinational companies, research and academic institutes. Role Overview Our client currently has a vacancy for a Java API developer fluent in English, to offer his/her services as an expert who will be based in Luxembourg. The work will be carried out either in the company’s premises or on site at customer premises. In the context of the first assignment, the successful candidate will be integrated in the Development team of the company that will closely cooperate with a major client’s IT team on site. Job type: Contract Duration: 6 months contract to begin with, possibility of extension later. Location: Luxembourg Workplace: Onsite Please note that we can consider only EU candidates for this position due to security clearance. Requirements University degree in IT or relevant discipline, combined with minimum 15 years of relevant working experience in IT; Minimum 8 years of experience working with Java 8–21; Minimum 6 years of experience with dependency management using Maven; Minimum 6 years of experience with SQL; Minimum 6 years of experience using XML and HTML as data formats; Minimum 6 years of experience with JSON; Minimum 5 years of experience with Spring Boot for backend development; Minimum 5 years of experience developing and integrating RESTful APIs; Minimum 5 years of experience using backend testing tools (JUnit, Mockito, Postman, Testcontainers, etc.); Minimum 5 years of experience developing in cloud environments such as AWS, Azure, or GCP; Minimum 5 years of experience with SaaS and CaaS hosting services; Minimum 5 years of experience using monitoring and logging tools such as the ELK stack and designing dashboards; Minimum 5 years of experience working in Agile/Scrum environments; Minimum 5 years of experience using the Atlassian suite (Jira, Confluence); Minimum 5 years of experience documenting code and configuration; Minimum 4 years of experience applying security standards such as SSDF and NIST 800-53; Minimum 3 years of experience designing vendor-neutral, cloud-portable applications; Minimum 3 years of experience with Apache Kafka for asynchronous event-driven processing; Minimum 3 years of experience managing Kafka schemas (e.g., Schema Registry); Minimum 3 years of experience with CI/CD practices and automation; Minimum 3 years of experience using Git repositories and delivery processes; Minimum 3 years of experience writing analysis documents; Minimum 3 years of experience writing installation instructions and technical guides; Minimum 2 years of experience using secrets management tools such as HashiCorp Vault; Minimum 2 years of experience working with RDF, knowledge graphs, and triple stores; Minimum 2 years of experience developing containerized applications using Docker; Minimum 1.5 years of experience monitoring and troubleshooting Kafka data flows and consumer performance; Minimum 1 year of experience with GraphQL; Minimum 1 year of experience with WSO2 API Gateway or similar; Minimum 1 year of experience working in cloud-agnostic environments; Minimum 1 year of experience managing licensing and compliance of integrated components; Excellent command of the English language and good knowledge of French. Responsibilities Developing vendor-agnostic portable applications; Developing back-end applications; Integrating Spring Boot applications with external services; Developing and integrating Java APIs, especially with RESTful services; Securing applications and using secrets management tools like Hashicorp Vault; Integrating and configuring databases, e.g. Liquibase or similar; Containerizing applications with Docker, ideally with solutions compatible with cloud-agnostic environments; Working with licensing and compliance aspects and constraints of integrated components and dependencies.