Senior UNIX Engineer

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 800 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.

About Proximus NXT

Proximus NXT Luxembourg supports all organizations in their digital transformation, by providing holistic ICT & Telecommunication solutions, as well as tailored managed services. With our partners and customers, we co-create opportunities and enable growth in a secure and sustainable manner. As a result of our unique expertise in next-gen IT services, mobile and advanced connectivity, we help our customers achieve their ambitions and realize their vision.

Together with them and our partners we implement sovereign and trusted solutions that make people work smarter.– www.proximusnxt.lu

Overview: We are seeking a Senior Infrastructure Engineer specializing in the Red Hat ecosystem to drive the stability, automation, and modernization of our enterprise environment. Operating within structured ITIL and Agile frameworks, this role is responsible for the end-to-end lifecycle management of physical and virtual compute estates. The ideal candidate blends deep technical expertise in RHEL platforms and Ansible automation with strong operational accountability—ensuring infrastructure resilience, meeting strict SLA/KPI targets, and mitigating financial or operational penalties through rigorous change and incident management.

Key Responsibilities:
• Enterprise Platform & Lifecycle Management: deploy, and maintain physical and virtual server infrastructure from initial provisioning to decommissioning. Execute complex hardware migrations and baseline firmware patching schedules across the bare-metal fleet.
• Automation & Configuration Orchestration: develop, and scale enterprise-wide automation playbooks and workflows utilizing Ansible Automation Platform (AAP) and GitLab CI/CD pipelines to enforce configuration consistency.
• Infrastructure Governance: Oversee environment provisioning, patch management, and subscription compliance using Red Hat Satellite across RHEL 8, 9, and 10 lifecycles.
• ITIL & Operational Governance: Manage daily operations using ITSM tools such as ServiceNow and SMT. Strictly adhere to Incident, Problem, and Change Management workflows to maintain system availability and compliance.
• SLA/KPI Accountability: Monitor and maintain system uptime and delivery metrics against strict Service Level Agreements (SLAs) and Key Performance Indicators (KPIs). Proactively mitigate operational risks to prevent contractual or business performance penalties.
• Advanced Troubleshooting & RCA: Lead technical investigations into complex, systemic infrastructure failures. Conduct rigorous Root Cause Analysis (RCA) and deliver comprehensive remediations to prevent recurrence.
• Change Management & Impact Analysis: Evaluate risks associated with architectural changes, upgrades, and patches. Conduct detailed impact analyses within an Agile sprint framework to minimize downtime and ensure continuous delivery in high-availability environments.
• Network Integration: Collaborate with network engineering teams to manage host-level network configurations, troubleshooting core protocols and services including VLAN tagging, DNS, DHCP, and routing.
• Technical Documentation: Author and maintain high-quality engineering documentation, including Standard Operating Procedures (SOPs), runbooks, and post-mortem reports.

Qualifications & Core Competencies:
• Operating Systems: Deep, production-level expertise with Red Hat Enterprise Linux (RHEL 8 & 9), with a forward-looking understanding of RHEL 10 paradigms.
• Tools & Automation: Proven experience managing Red Hat Satellite, Git/GitLab workflows, and designing playbooks within Ansible Automation Platform.
• Hardware & Infrastructure: Hands-on experience managing the ph