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CGI

Senior Systems & Network Administrator (Windows, Linux, Cisco & F5)

Toronto, ON, Canada

Full-time

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Job details

Job type: Full-time
Apply by: Nov 5, 2026
Experience: Minimum 5+ years of hands-on experience as a Systems Administrator supporting Windows and Linux environments.
Posting language: English
Posted: Oct 6, 2026

Original job description

Position Description

Position Summary

We are seeking a highly skilled Senior Systems & Network Administrator to join our Infrastructure & Operations team. This role is responsible for the administration, maintenance, monitoring, and support of enterprise Windows, Linux, virtualization, network, firewall, and load balancing environments.

The successful candidate will possess strong technical expertise in server administration, network infrastructure, virtualization technologies, and operational support processes. This individual will play a key role in ensuring the availability, reliability, security, and performance of critical business systems while supporting projects, incident management, change management, and continuous improvement initiatives.

This position requires a hands-on infrastructure professional capable of supporting server, network, and security technologies in a fast-paced enterprise environment.

________________________________________

Your future duties and responsibilities

Key Responsibilities

Systems Administration

Administer, maintain, and support enterprise Windows and Linux server environments.
Build, deploy, configure, patch, upgrade, and maintain physical and virtual servers.
Manage Windows Server (2019, 2022 and newer) and Red Hat Enterprise Linux (RHEL 7, 8, and 9) environments.
Perform system hardening, server lifecycle management, vulnerability remediation, and operating system upgrades.
Manage backup, recovery, migration, and restoration activities.
Review system, application, and infrastructure logs to proactively identify and resolve issues.
Ensure server reliability, availability, and performance through ongoing monitoring and maintenance.

Virtualization & Infrastructure

Administer and support enterprise virtualization platforms, including:
VMware vSphere
Microsoft Hyper-V
KVM
Provision and manage virtual infrastructure resources.
Perform capacity planning and resource utilization analysis.
Support infrastructure modernization, upgrades, and transformation initiatives.

Network, Firewall & Load Balancer Administration

Administer and support enterprise network infrastructure and services.
Manage and maintain Cisco Firewall environments, including:
Firewall policy administration
Access control management
NAT configuration
VPN administration
Security rule reviews
Troubleshooting connectivity and security issues
Administer and support F5 BIG-IP Load Balancers, including:
Virtual Servers
Pools and Pool Members
Health Monitors
SSL Certificate Management
Traffic Management Policies
High Availability configurations
Configure, manage, and troubleshoot:
Site-to-Site VPNs
Remote Access VPNs
Assist with network design, implementation, and troubleshooting activities.
Monitor network performance, traffic flows, and utilization trends.
Support network security initiatives and infrastructure hardening activities.
Analyze firewall logs, traffic reports, and packet captures to diagnose issues.

Core Infrastructure Services

Administer and support:
Active Directory
DNS
DHCP
Group Policy
NTP
TCP/IP Networking
Account Management
Manage and troubleshoot file sharing technologies, including:
NFS
CIFS
SMB
Maintain permissions and access controls across server and storage environments.

Monitoring & Incident Management

Review and verify:
Infrastructure health reports
Data integrity reports
Resource utilization reports
Monitoring alerts and notifications
Intake, triage, investigate, and resolve incidents, service requests, and operational issues.
Monitor system and network performance to minimize interruptions and maximize service availability.
Participate in major incident response and restoration activities.
Ensure incidents, requests, and tasks are updated and resolved within established service levels.
Perform root cause analysis and contribute to problem management activities.

Change Management & Project Delivery

Participate in change management and advisory processes.
Create implementation, validation, and rollback plans.
Maintain accurate records for infrastructure changes and operational activities.
Provide infrastructure expertise and operational input during project planning and execution.
Collaborate with architects, engineers, application teams, vendors, and business stakeholders.

Documentation & Continuous Improvement

Create, maintain, and update:
Technical documentation
Standard operating procedures
Knowledge base articles
Infrastructure diagrams
Configuration records
Contribute to operational standards, automation initiatives, and continuous improvement efforts.
Support knowledge transfer and mentoring activities within the team.

________________________________________

Required Qualifications

Required qualifications to be successful in this role

Education

Degree or Diploma in Computer Science, Information Technology, or a related technical discipline.
Relevant industry certifications are considered an asset.

Experience

Minimum 5+ years of hands-on experience as a Systems Administrator supporting Windows and Linux environments.
Experience supporting enterprise infrastructure in medium to large organizations.
Experience working within a fast-paced operations environment.
Experience supporting production-critical systems and business services.
Demonstrated ability to manage multiple priorities and deliver results under pressure.

________________________________________

Technical Qualifications

Operating Systems

Advanced administration experience with:
Windows Server 2008, 2012, 2016 and newer
Red Hat Enterprise Linux (RHEL 7, 8, and 9)

Virtualization

Experience supporting:
VMware vSphere
Microsoft Hyper-V
KVM

Windows Infrastructure

Strong practical experience with:
Active Directory
DNS
DHCP
Group Policy
Account Administration
Windows Security

Network & Security

Strong understanding of:
TCP/IP
Routing and Switching
VLANs
Network Segmentation
VPN Technologies
Network Security Principles
SSL/TLS Certificates
Load Balancing Concepts
Hands-on administration experience with:
Cisco Firewalls (ASA and/or Firepower)
F5 BIG-IP Load Balancers
Site-to-Site VPNs
Remote Access VPNs
Ability to troubleshoot issues across server, storage, network, firewall, and application layers.

Storage & File Services

Experience with:
NFS
CIFS
SMB
Enterprise Storage Solutions

Enterprise Tools

Experience using enterprise platforms for:
Monitoring and Alerting
Incident and Problem Management
Change Management
Ticketing Systems
Knowledge Repositories
SharePoint

Automation (Preferred)

Experience with:
PowerShell
Bash
Python
Infrastructure automation tools

________________________________________

Desired Skills & Competencies

Excellent analytical and troubleshooting skills.
Strong understanding of system architecture, storage solutions, network topologies, and infrastructure security best practices.
Ability to interpret system, application, firewall, and network logs.
Strong customer service and service-delivery mindset.
Excellent verbal and written communication skills.
Strong organizational and time management abilities.
Ability to work independently and collaboratively across technical teams.
Strong attention to detail and commitment to operational excellence.

________________________________________

Preferred Certifications

Microsoft Certified certifications
Red Hat Certified System Administrator (RHCSA) or RHCE
VMware VCP
Cisco CCNA or CCNP
F5 Certified Administrator (F5-CA)
ITIL Foundation Certification

CGI is providing a reasonable estimate of the pay range for this role. The determination of this range includes factors such as skill set level, geographic market, experience and training, and licenses and certifications. Compensation decisions depend on the facts and circumstances of each case. A reasonable estimate of the current range is $85,000–$135,000. This role is an existing vacancy.

Together, as owners, let’s turn meaningful insights into action.

Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll reach your full potential because…

You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.

Your work creates value. You’ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.

You’ll shape your career by joining a company built to grow and last. You’ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.

At CGI, we value the strength that diversity brings and are committed to fostering a workplace where everyone belongs. We collaborate with our clients to build more inclusive communities and empower all CGI partners to thrive. As an equal-opportunity employer, being able to perform your best during the recruitment process is important to us. If you require an accommodation, please inform your recruiter.

That same commitment to fairness extends to how we use technology. To support our recruitment team, AI tools may be used to help assess applications though they never replace human judgement. All hiring decisions remain entirely in the hands of our recruitment professionals.

To learn more about accessibility at CGI, contact us via email. Please note that this email is strictly for accessibility requests and cannot be used for application status inquiries.

Come join our team - one of the largest IT and business consulting services firms in the world.

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More about this job

Responsibilities

Administer and maintain enterprise Windows and Linux servers, virtualization platforms, network infrastructure, Cisco firewalls, F5 load balancers, and core infrastructure services. Monitor and troubleshoot production systems, manage incidents and changes, support infrastructure projects, and maintain operational documentation and improvements.

Requirements

Requires a degree or diploma in computer science, information technology, or a related technical discipline, plus at least five years of hands-on Windows and Linux systems administration experience. Candidates should have enterprise infrastructure experience and practical knowledge of virtualization, networking, firewalls, load balancing, storage and file services, and operational support processes.

Skills

Windows Server Administration
Linux Server Administration
VMware vSphere
Microsoft Hyper-V
KVM
Cisco Firewalls
F5 BIG-IP Load Balancers
Active Directory
DNS
DHCP
TCP/IP Networking
VPN Administration
Network Security
NFS, CIFS, and SMB
Incident and Change Management
PowerShell, Bash, and Python

Visa sponsorship

Not detected in the job text

Keywords

Windows Server
Red Hat Enterprise Linux
VMware vSphere
Microsoft Hyper-V
KVM
Cisco ASA
Cisco Firepower
F5 BIG-IP
Active Directory
DNS
DHCP
Group Policy
TCP/IP
Routing and Switching
VLANs
Network Segmentation
Site-to-Site VPN
Remote Access VPN
SSL/TLS Certificates
NFS
CIFS
SMB
PowerShell
Bash
Python
Incident Management
Change Management
Vulnerability Remediation
Root Cause Analysis
RHCSA

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