To reinforce our teams, we are looking for a Senior Web & Application Server Engineer speaking English and French. Your main responsibilities Design, develop, and maintain Web and Application Server components (Apache Red Hat JBoss EAP, Oracle WebLogic) for Cloud-based deployments using OpenShift and IaaS/VM platforms. Take ownership of assigned projects, act as a technical lead, and coordinate small teams when required. Assess new technologies and propose innovative solutions for critical applications. Define and document system architecture and security standards, especially for Internet-facing applications. Maintain and enhance Java/JavaEE integration components, including security modules, documentation, and test suites. Collaborate closely with development, infrastructure, and security teams and manage interactions with Middleware/software vendors. Participate in major production releases (around 4 per year, some on Saturdays). Your profile You have at least 5 years of experience in a similar position. Master's degree in Computer Science or equivalent. Fluent in English and French. German is a real asset. Technical skills: Hands-on experience configuring, deploying, and supporting Web application infrastructures (Apache and JBoss EAP on Linux). Strong understanding of high-availability, security, and transaction management in distributed environments. Practical knowledge of TLS/PKI, including certificate/key deployment and configuration in Web and Middleware services. Experience in application security design and vulnerability assessments. Ability to justify and challenge technical decisions and produce high-quality technical documentation in English. Solid experience with the follorwing technologies: Linux (Red Hat), OpenShift, Docker, Kubernetes, ArgoCD, Helm, Java/JavaEE, Maven, GIT, SSO solutions, Cloud platforms. Soft skills: Analytical Thinking & Problem-Solving Autonommy and proactivity Leadership and Team Coordination Attention to Detail If at the end of the recruitment process your application is successful, you will be asked for a criminal record. What is offered Take the opportunity to join our "NSI family", where human values remain at the heart of our priorities Permanent contract Training courses Dynamic and innovative environment Be in the position to open your career perspectives Competitive salary package If you do not receive any answer within around 20 days, you should consider that we cannot proceed with your application. NSI-CEGEKA Group is based in Luxembourg, Belgium, France & Canada. The company celebrated its 30th anniversary in 2023. NSI is a provider of value-added IT services (Agile application development, ERP, cloud infrastructure, professional services) for the private and public sectors.