Systems Administrator supporting secure cloud - hosted research applications, agentic AI systems, and scientific SaaS platforms. Administering multi - cloud infrastructure, containers, identities, monitoring, and production services.
About the role
- Senior Systems Administrator leading enterprise infrastructure operations for GHS, an IT and managed services provider. Supporting Windows, Linux, Azure, Microsoft 365, VMware, and client environments.
Responsibilities
- Design, deploy, and maintain IT infrastructure including physical and virtual servers, operating systems, storage platforms, and supporting services
- Ensure infrastructure availability, reliability, security, and performance through proactive monitoring, maintenance, and capacity management
- Plan and execute operating system upgrades, security patches, maintenance releases, and infrastructure lifecycle activities
- Implement, test, and maintain backup, disaster recovery, and business continuity solutions
- Support data centre and server room operations, hardware deployments, equipment lifecycle management, and infrastructure support activities
- Maintain infrastructure documentation, architecture diagrams, configuration standards, operational procedures, and technical runbooks
- Maintain and audit software, hardware, and infrastructure asset inventories
- Respond to and resolve infrastructure incidents, service requests, and operational issues according to service-level agreements
- Act as primary technical escalation point for Service Desk, L2 Support, SysAdmin, and Linux SysAdmin resources
- Lead root cause analysis for major incidents and recurring technical issues, tracking corrective actions to completion
- Coordinate technical escalations with vendors, clients, cloud providers, and internal specialist teams
- Participate in scheduled on-call rotation and provide after-hours support when required
- Provide technical leadership, mentorship, coaching, and knowledge transfer to infrastructure team members
- Establish and maintain infrastructure standards, procedures, governance, and best practices
- Drive automation, standardization, continuous improvement, and operational maturity initiatives
- Administer and support Active Directory, Entra ID, Microsoft 365, Group Policy, and identity/access management services
- Support hybrid infrastructure across on-premises environments, Azure, Microsoft 365, IBM Cloud, and GCP
- Support Managed Services client infrastructure including Windows Server, VMware, Hyper-V, Veeam, storage, backup, and related x86 platforms
- Participate in vulnerability remediation, security hardening, compliance, change management, and operational risk management
- Lead infrastructure projects through planning, implementation, validation, documentation, and transition to operations
- Evaluate technologies, architecture designs, and operational processes and recommend improvements for scalability, resiliency, security, and supportability
Requirements
- University degree or diploma in Computer Science, Information Technology, or an equivalent combination of education, training, and relevant experience
- 8+ years of progressive infrastructure administration experience within enterprise IT and/or Managed Services environments, including support for multiple client infrastructures
- Strong administration experience across enterprise Windows Server and Linux environments, including physical, virtual, and hybrid cloud infrastructure
- In-depth experience with server patching, compliance, and lifecycle management using WSUS, SCCM/MECM, BigFix, or equivalent enterprise management platforms
- Strong VMware vSphere, Hyper-V, backup, and disaster recovery experience, including clustered, highly available, and recovery-enabled environments
- Strong knowledge of SAN/NAS storage, Fibre Channel concepts, and core networking technologies including TCP/IP, DNS, DHCP, VPN, FTP, and SFTP
- Advanced experience with Active Directory, Entra ID, Group Policy, authentication, identity lifecycle management, and hybrid identity services
- Hands-on experience supporting Azure and Microsoft 365 environments, with ability to provide L2 operational support for GCP and IBM Cloud environments
- Experience configuring, maintaining, and improving enterprise monitoring and alerting platforms such as ManageEngine, Checkmk, or similar solutions
- Ability to lead complex technical escalations, major incident resolution, root cause analysis, and corrective actions
- Demonstrated experience leading infrastructure projects, technical implementations, migrations, operational handovers, and transition-to-support activities
- Ability to review infrastructure designs, assess risk, plan capacity, and recommend improvements
- Experience coordinating service delivery and technical escalations with vendors, clients, cloud providers, and internal stakeholders
- Experience mentoring technical resources and providing technical leadership across Service Desk, L2 Support, SysAdmin, and Linux SysAdmin teams
- Strong understanding of security hardening, vulnerability remediation, compliance requirements, change management, and operational risk management
- Experience with ITSM platforms such as ServiceNow, with strong technical documentation skills
- Ability to participate in on-call rotation and occasionally travel to client sites and data centers within the Greater Toronto Area
- Legally eligible to work in Canada
- Successful criminal record check
- Nice-to-have certifications and skills include VCP, Microsoft Azure Administrator Associate, Microsoft Identity and Access Administrator Associate, Windows Server Hybrid Administrator Associate, VMCE, advanced Linux administration, IBM Cloud, Rubrik, Zerto, IBM Spectrum Protect/TSM, Fibre Channel switches, VTL, PowerShell, Python, Ansible, Infrastructure-as-Code, LAN/WAN, routing, switching, firewalls, and network troubleshooting
Benefits
- Competitive salary
- Health benefits (medical, vision, dental)
- Life insurance
- Pension plan
- Professional development
- Amazing company culture
- Free parking
- Gym on-site
- Diverse and inclusive workplace
- Accommodation through each stage of the recruitment process for individuals with disabilities
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