Infrastructure operator

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.