Senior Windows System Engineer

About the Role

Our client, a leading financial institution based in Luxembourg, is seeking a Senior Windows System Engineer to join its IT Production Department.

Reporting directly to the Head of Division, the successful candidate will play a key role in ensuring the stability, performance, high availability, and security of the Bank's critical Windows Server infrastructure operating within a highly regulated banking environment.

The position covers a broad range of infrastructure engineering activities, including Windows Server administration, PowerShell automation, Active Directory & PKI governance, Level 3 incident escalation, technical project coordination, and knowledge transfer to L2 teams.

This is a highly visible technical role requiring close interaction with cross-functional teams, including Risk, Cybersecurity, Application teams, and Infrastructure operations.

Key Responsibilities

• Windows Systems Engineering & High Availability
  • Administer, maintain, and continuously optimize critical Windows Server infrastructure (versions 2016, 2019, 2022, and 2025).
  • Ensure second-line operational management of key Microsoft infrastructure components, including Active Directory, ADFS, ADCS, and Windows Failover Clusters.
  • Guarantee adherence to strict banking SLAs, high-availability requirements, and service quality standards.

• Automation, Scripting & System Optimization
  • Design, develop, and deploy advanced PowerShell scripts to automate administrative tasks and system deployments.
  • Proactively identify areas for infrastructure hardening, automation, and reliability improvement.

• Cybersecurity & Compliance Integration
  • Implement and enforce security best practices and hardening guidelines across all Microsoft server environments.
  • Ensure infrastructure alignment with internal security policies, risk frameworks, and regulatory banking requirements.

• Technical Coordination & Project Management
  • Lead and coordinate technical mini projects within the IT infrastructure perimeter.
  • Collaborate closely with multi-disciplinary teams (VMware, Network, Security, Applications) to ensure successful project execution.
  • Plan and manage workload autonomously using project management methodology (e.g., MS Project).

• L3 Support & Knowledge Transfer
  • Act as an escalation point for complex Level 3 technical troubleshooting and incident resolution.
  • Author, maintain, and update high-quality technical documentation and procedures.
  • Provide structured knowledge transfer and guidance to Level 2 operational teams.

Required Qualifications & Experience

• Education: Master's or bachelor's degree in computer science, System Engineering, Information Technology, or a related field.

• Professional Experience
  • Minimum 8 years of experience in IT system engineering and administration.
  • Proven experience working within high-availability, mission-critical environments (Banking, Finance, or insurance sector strongly preferred).

• Technical Mastery:
  • Confirmed expertise in Windows Server (2016, 2019, 2022, 2025).
  • Advanced scripting and automation capabilities with PowerShell.
  • Strong expertise in Active Directory, ADFS, ADCS, and Windows Failover Clustering.
  • Solid understanding of Microsoft infrastructure security and hardening practices.

• Asset / Complementary Skills:
  • Hands-on exposure to virtualization technologies (VMware, Omnissa Horizon).
  • Familiarity with network concepts (DNS, WebProxy, Firewalls, Load Balancing) and MS Project.

Language Requirements: Knowledge of Luxembourgish constitutes a strong advantage.

Professional fluency in French AND English (both written and spoken) is mandatory.