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Senior System Engineer

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Alter Domus

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Location:
Luxembourg , Luxembourg

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Contract Type:
Not provided

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Salary:

Not provided

Job Description:

Alter Domus is seeking a skilled and proactive Microsoft 365 Specialist (Senior System Engineer) to join our Global IT Operations team. This role is essential in ensuring the effective deployment, management, and security of our Microsoft 365 environment. You will also engage with key stakeholders and leverage your technical expertise to enhance end user experience. This position requires a blend of technical expertise, problem-solving skills, and effective communication to ensure seamless operations and support for our global user base. The ideal candidate will possess a deep understanding of Microsoft ecosystem, particularly Microsoft 365 services, and will be responsible for implementing best practices to safeguard our data and enhance productivity across the organization.

Job Responsibility:

  • Manage and support the Microsoft 365 environment, including Exchange Online, Intune, SharePoint, Defender, Entra ID and Teams
  • Collaborate with cross-functional teams to integrate Microsoft 365 solutions with existing systems and workflows, enhancing overall operational efficiency
  • Oversee the procurement, allocation, and management of Microsoft 365 licenses, ensuring compliance with licensing agreements and optimizing license usage across the organization
  • Implement and maintain security protocols and best practices (CIS) to protect sensitive data within the Microsoft ecosystem, including user access controls, data loss prevention, and threat protection measures
  • Monitor system performance and security incidents, generating reports and insights to inform decision-making and improve service delivery
  • Deliver technical support and training to the Level 1 and Level 2 teams
  • Stay updated on the latest Microsoft 365 features and security trends, recommending enhancements and upgrades to improve functionality and security posture
  • Develop and maintain comprehensive documentation that supports end user operations, including guides for troubleshooting common issues, step-by-step instructions and best practices

Requirements:

  • Minimum of 6 years of relevant experience in the IT industry
  • Exceptional oral and written communication skills
  • Detail-oriented and organized, with a proven ability to meet deadlines in a fast-paced environment
  • Strong work ethic, responsiveness, and a commitment to customer service excellence
  • Excellent team player with strong interpersonal skills
  • Self-motivated and capable of thriving in a project-based environment
  • Advanced expertise in mail flow, hybrid configurations, transport rules, connectors, and accepted domains. Strong troubleshooting: message trace, header analysis
  • Strong knowledge in Conditional Access, Identity Protection, MFA, Single Sign-On
  • Intune Management: Device compliance, Windows Autopatch & Autopilot, Security baselines, configuration profiles, update rings, and app deployment
  • Defender XDR ecosystem: Defender for Endpoint, Identity, Office, Cloud Apps
  • PowerShell, Graph API queries, automation scripts, bulk provisioning
  • Proficient in managing Active Directory, Group Policy
  • Proven experience in End User Experience Support, with a focus on delivering high-quality service and support

Nice to have:

Knowledge of the Apple ecosystem (JAMF) would be considered an advantage

What we offer:
  • Support for professional accreditations such as ACCA and study leave
  • Flexible arrangements, generous holidays, plus an additional day off for your birthday
  • Continuous mentoring along your career progression
  • Active sports, events and social committees across our offices
  • 24/7 support available from our Employee Assistance Program
  • The opportunity to invest in our growth and success through our Employee Share Plan
  • Plus additional local benefits depending on your location

Additional Information:

Job Posted:
January 29, 2026

Work Type:
Hybrid work
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