Systems Administrator

Server & platform engineering

• Design, deploy, and maintain Windows Server environments (Active Directory, DNS, DHCP, GPO, PKI)
• Administer Linux servers (RHEL/CentOS/Ubuntu) — installation, hardening, patching, and performance tuning
• Manage services running on Linux: web servers, databases, application runtimes, and scheduled jobs
• Administer and optimise virtualisation platforms (VMware vSphere / Hyper-V) at scale
• Manage and develop the hybrid Azure infrastructure — IaaS, resource groups, policy, cost management
• Own the Microsoft 365 tenant administration: Exchange Online, Teams, SharePoint, OneDrive, Intune
• Manage Azure Active Directory / Entra ID: identity governance, conditional access, SSO, MFA
• Drive automation using PowerShell, Azure Automation, or similar scripting tools
  
  

Network & security engineering

• Design and manage network architecture: routing, switching, VLANs, SD-WAN, firewalls
• Implement and maintain security baselines: patch management, CIS benchmarks, endpoint hardening
• Manage Microsoft Defender, Sentinel, or equivalent SIEM/EDR tooling
• Operate and improve backup, replication, and disaster recovery solutions
• Support IT security audits, risk assessments, and compliance requirements
  
  

Global projects & architecture

• Collaborate as an equal peer with the systems team at Bertus HQ in the Netherlands
• Contribute to and lead global infrastructure rollouts, migrations, and standardisation projects
• Evaluate and recommend new technologies, platforms, and architectural improvements
• Participate in architectural decisions and capacity planning across both sites
• Maintain thorough documentation of architecture, runbooks, and change records
• Participate in on-call rotation for critical incidents across time zones
  
  

Required Knowledge & Experience

• Bachelor's degree (B.Tech / BCA / BSc IT or equivalent) in a relevant IT discipline
• 4–7 years of hands-on experience in a systems engineering or infrastructure role — not helpdesk
• Deep expertise in Windows Server, Active Directory, and Microsoft 365 / Azure administration
• Strong Linux administration skills: RHEL/CentOS or Ubuntu/Debian in a production environment
• Experience with Linux system hardening, package management, systemd, and log analysis
• Strong virtualisation skills: VMware vSphere and/or Microsoft Hyper-V
• Solid networking knowledge: TCP/IP, BGP/OSPF, VLANs, firewalls, VPN
• Proficiency in scripting for automation: PowerShell and Bash (Python is a plus)
• Fluent written and spoken English — you will work daily with Dutch colleagues
  
  

Nice to have — bonus points

• Microsoft certifications: AZ-104, AZ-305, MS-102, SC-300 or equivalent
• Linux certifications: RHCSA, RHCE, LPIC-1/2, or equivalent
• Experience with VMware certifications (VCP) or NSX
• Familiarity with DevOps tooling: Terraform, Ansible, CI/CD pipelines
• Experience in an international or European-headquartered organisation
• ITIL or similar service management framework experience
  
  

Skills:- System Administration, Microsoft Windows Server, Active Directory, Windows Azure, Microsoft Windows, Windows PowerShell, VMWare, Hyper V, TCP/IP, Computer Networking and Intune