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System Administrator

Adentis Portugal · Lisbonne

Hybrid 🇬🇧 English
Windows Server Active Directory DNS DHCP PowerShell Microsoft Exchange Exchange Online Exchange Hybrid Office 365 Azure AWS

Descrição do cargo

About the role

ADENTIS is looking for an experienced Windows System Administrator to join its IT team. You will be responsible for the design, implementation and day‑to‑day operation of the company’s Windows Server and Office 365 environments, ensuring high availability, security and performance.

Key responsibilities

  • Administer, maintain and support Windows Server infrastructure with a focus on Active Directory.
  • Manage AD objects, groups, GPOs, DNS, DHCP and authentication services.
  • Monitor, troubleshoot and resolve issues across AD, DNS, DHCP and related services.
  • Administer Microsoft Exchange (on‑premise and/or online) and Office 365, including mail flow, security and compliance.
  • Perform regular updates, patching, backups and disaster‑recovery tests.
  • Collaborate with infrastructure, security and support teams on projects and operational tasks.
  • Document configurations, procedures and operational processes.

Required profile

  • Proven experience as a Windows System Administrator with hands‑on Active Directory management.
  • Strong knowledge of Windows Server, AD, GPOs, DNS, DHCP and authentication mechanisms.
  • Experience with PowerShell scripting for automation.
  • Solid background administering Microsoft Exchange and Office 365 environments.
  • Ability to communicate effectively with both technical and non‑technical stakeholders.
  • EU citizenship, Portuguese work visa or residency and availability to work on‑site two to three days per week.

Required skills

  • Windows Server
  • Active Directory
  • Group Policy Objects
  • DNS
  • DHCP
  • PowerShell
  • Microsoft Exchange (Exchange Online, Hybrid)
  • Office 365
  • Azure (optional)
  • AWS (optional)

What we offer

  • Great work‑life balance and flexible organisational routine.
  • Health benefits for you and your family.
  • Team‑building activities and over 300 discount protocols.
  • Continuous professional development sponsored by the Training and Certification Department.
  • Regular performance feedback and a clear career progression plan.

Questions fréquentes

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Adentis Portugal

Lisbonne