Engineer Windows System Senior

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

o  Administer, maintain, and continuously optimize critical Windows Server infrastructure (versions 2016, 2019, 2022, and 2025).

o  Ensure second-line operational management of key Microsoft infrastructure components, including Active Directory, ADFS, ADCS, and Windows Failover Clusters.

o  Guarantee adherence to strict banking SLAs, high-availability requirements, and service quality standards.

·       Automation, Scripting & System Optimization

o  Design, develop, and deploy advanced PowerShell scripts to automate administrative tasks and system deployments.

o  Proactively identify areas for infrastructure hardening, automation, and reliability improvement.

·       Cybersecurity & Compliance Integration

o  Implement and enforce security best practices and hardening guidelines across all Microsoft server environments.

o  Ensure infrastructure alignment with internal security policies, risk frameworks, and regulatory banking requirements.

·       Technical Coordination & Project Management

o  Lead and coordinate technical mini projects within the IT infrastructure perimeter.

o  Collaborate closely with multi-disciplinary teams (VMware, Network, Security, Applications) to ensure successful project execution.

o  Plan and manage workload autonomously using project management methodology (e.g., MS Project).

·       L3 Support & Knowledge Transfer

o  Act as an escalation point for complex Level 3 technical troubleshooting and incident resolution.

o  Author, maintain, and update high-quality technical documentation and procedures.

o  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:
• Professional fluency in French AND English (both written and spoken) is mandatory.
• Knowledge of Luxembourgish constitutes a strong advantage.