About Proximus Luxembourg Proximus Luxembourg is a leading historical player in the ICT & Telecoms markets. Proximus Luxembourg addresses both residential and business markets through its commercial brands Tango, Proximus NXT and more recently Codit.
With PSF support status, the company has almost 750 employees. All these experts share a passion for digital technology, a spirit of openness and innovation, and a desire to simplify, connect and make their customers' personal and professional activities ever more secure.
Proximus Luxembourg is actively contributing to the acceleration of Luxembourg's digitalisation and its economic influence through the development of connectivity, resilient infrastructures and 5G, as well as innovative technologies such as Blockchain, Artificial Intelligence, Machine Learning and IoT.
Proximus Luxembourg is a subsidiary of the Proximus group (Euronext Brussels: PROX), provider of digital services and communication solutions operating in the Belgian and international markets.
Your mission : As part of the development of an isolated sovereign cloud environment (air-gapped) , we are looking for an Infrastructure Operator responsible for operating, maintaining, and monitoring critical infrastructures based on cloud-native technologies.
As the environment is isolated from any Internet access, the position requires rigor, autonomy, and strong analytical skills in highly constrained and secure environments.
Key Responsibilities
Operation and monitoring of Linux infrastructures in a critical environment
Administration and maintenance of Kubernetes clusters
Handling Level 2 / Level 3 incidents and participation in crisis management when required
Deployment, updates, and patch management in an air-gapped environment
Performance monitoring, capacity management, and resource optimization
Management of backup and restoration procedures
Participation in security procedures and compliance with regulatory standards
Writing and maintaining technical documentation and operational procedures
Contributing to the continuous improvement of operational processes
Your profile : Mandatory
Linux administration (RHEL / Ubuntu or equivalent)
Kubernetes administration and troubleshooting (cluster management, networking, storage, RBAC)
Strong understanding of cloud-native architectures
Networking knowledge (TCP/IP, DNS, firewalling)
Scripting
Nice to Have
Experience in air-gapped or highly secure environments
Knowledge of monitoring tools (Grafana, Prometheus, ELK)
Experience managing virtualized infrastructures
DevOps concepts / GitLab / GitOps
Understanding of regulatory constraints related to sovereign cloud environments
Profile
Degree or education equivalent to Bachelor's level (Bac +3)
Relevant experience (ideally 2+ years) in infrastructure operations
Strong attention to detail, autonomy, and ability to work in constrained environments
Strong security mindset
Good team spirit and service orientation
Professional English required
Specific Conditions
Extended working hours may apply (between 6:00 AM and 10:00 PM) depending on organization
On-call duty may be required according to the schedule
Our offer : A professional and stimulating work environment in the IT & telecom sector. Multiple career opportunities within the Proximus Group at national and international level, cutting-edge training in new technologies, a wealth of recognized expertise. We also offer an attractive salary package and many other benefits.
Our company is an equal opportunity employer, valuing diversity in all its forms. We firmly believe that each individual brings a unique richness to our teams, and we are committed to creating an inclusive environment where every voice counts.
If at the end of the process your application is successful, you will be asked to provide an extract from your criminal record. Your personal information will be handled in compliance with applicable data protection laws.
