What are the responsibilities and job description for the System Administrator position at LinkTech?
Position Summary
The System Administrator is a senior-level, hands-on leader responsible for the post-integration strategic design, development, and administration. We are seeking a technical expert who can perform both high-level system architecture and deep-dive
Responsibilities
Microsoft 365 & Identity (Primary Focus)
- Administer and continuously improve Microsoft 365 services including Exchange Online, SharePoint, Teams, and OneDrive
- Own identity lifecycle management across Microsoft Entra ID, including hybrid identity configuration via Entra Connect
- Design and enforce authentication and access governance policies — MFA, Conditional Access, PIM/PAM, and RBAC
- Lead the migration from on-premises Exchange Server to Microsoft 365, including planning, cutover, and post-migration support
- Lead the migration from on-premises Active Directory to Microsoft Entra ID, including hybrid identity strategy and transition planning
- Implement and manage Microsoft Intune for modern device management, endpoint compliance, and policy enforcement
- Serve as the escalation point for identity, authentication, and M365 platform issues
- Monitor platform health and proactively address performance, security, and compliance concerns
- Collaborate with Security, HRIS, Infrastructure, and Operations teams to support audit and compliance requirements
- Maintain accurate documentation, runbooks, architecture diagrams, and operational standards
On-Premises Infrastructure & Networking (Secondary Focus)
- Provide senior-level oversight of Windows Server and Linux/Unix environments, with a strong focus on system uptime and availability across all production and operational systems
- Setup, manage, and maintain network infrastructure including firewalls, VLANs, switches, and routing to ensure reliable and secure connectivity across facilities
- Deploy and manage network monitoring tools to proactively identify and resolve connectivity, performance, and availability issues before they impact operations
- Administer DHCP and DNS services, ensuring accurate IP management and name resolution across the environment
- Maintain VMware virtualization infrastructure and support backup and disaster recovery operations
- Leverage PowerShell and Bash scripting to automate tasks and bridge on-prem and cloud workflows
Qualifications
- 5 years of experience in systems administration, with significant depth in Microsoft 365 and Entra ID
- Strong hands-on experience with Exchange Online, SharePoint, Teams, and OneDrive administration
- Deep understanding of identity lifecycle management, MFA, Conditional Access, and privileged access management
- Experience with Entra ID (Azure AD), Entra Connect, and hybrid identity architectures
- Experience with Microsoft Intune for MDM and endpoint compliance
- Solid understanding of networking fundamentals firewalls, VLANs, switching, routing, DNS, and DHCP
- Experience configuring and managing enterprise firewalls and VLAN segmentation in a multi-site or manufacturing environment
- Hands-on experience with network and infrastructure monitoring platforms such as PRTG, SolarWinds, Nagios, or Zabbix
- Demonstrated track record of maintaining high system uptime in a production or operations-critical environment
- Proficiency in PowerShell scripting for automation and administration
- Proven ability to lead complex migration projects with cross-functional stakeholders
- Strong communication, documentation, and collaboration skills across technical and non-technical teams
- Working knowledge of on-premises infrastructure — Windows Server, Linux/Unix, and VMware