Senior Windows Systems Administrator - 365, AD & Security

Destinus; Katwijk; On-site; EUR 70,000 - 90,000; Full time

Job summary

Destinus in Katwijk, Netherlands is seeking a Windows Systems Administrator to manage, secure, and optimize a broad IT estate. You will drive reliability across Microsoft 365, Windows Server, and AD, while embedding a proactive security mindset. The role supports UAV-focused defence operations with global government partners.

You will configure Intune/Autopilot, administer Jira/Confluence, and contribute to IT strategy with a focus on security, scalability, and incident readiness.

Qualifications

• Bachelor’s degree or equivalent in IT/CS.
• 5+ years’ Windows systems administration experience.
• Strong Windows Server and Active Directory skills (DNS, DHCP, Group Policy).
• Proficient Microsoft 365 administration (identity, access, device management).
• PowerShell scripting for automation.
• Experience with virtualization (VMware/Hyper-V) and storage tech.
• Knowledge of MFA, OIDC, SAML 2.0, SCIM, Entra ID integrations.
• Networking basics (TCP/IP, VLANs, VPNs).
• Familiarity with monitoring tools (PRTG, SolarWinds, SIEM).
• Understanding Zero Trust and ISO27001/NIS2 frameworks.

Responsibilities

• Administer and optimize Microsoft 365 services (Exchange Online, SharePoint, Teams, Defender, Entra ID, Intune).
• Maintain Windows Server environments – AD, DNS, DHCP, GPOs, file services, patching, backups.

Skills

Windows administration

PowerShell scripting

Security mindset

Problem solving

Ownership & initiative

Education

Bachelor’s degree in IT or CS

Tools

Microsoft 365

Active Directory

Intune

Entra ID

Autopilot

Exchange Online

SharePoint

Jira

Confluence

VMware

Hyper-V

DFS

DNS

DHCP

PRTG

SIEM

Job description

Destinus in Katwijk, Netherlands is seeking a Windows Systems Administrator to manage, secure, and optimize a broad IT estate. You will drive reliability across Microsoft 365, Windows Server, and AD, while embedding a proactive security mindset. The role supports UAV-focused defence operations with global government partners.

You will configure Intune/Autopilot, administer Jira/Confluence, and contribute to IT strategy with a focus on security, scalability, and incident readiness.