System Administrator jobs in London, ON

Job Overview

We are seeking a dynamic and highly skilled Senior IT Network Administrator to lead our organization's network infrastructure and ensure seamless connectivity across all platforms. In this pivotal role, you will design, implement, and maintain robust network solutions that support our business operations. Your expertise will drive innovation, optimize performance, and enhance security across cloud environments and on-premises systems. Join us to empower our technological backbone and contribute to our mission of delivering exceptional digital experiences.

Senior IT Network Administrator Job Summary

We are seeking an experienced Senior IT Network Administrator to design, implement, maintain, and secure the organization’s network infrastructure. The successful candidate will be responsible for ensuring high availability, performance, reliability, and security across LAN, WAN, wireless, cloud, and remote-access environments.

The Senior IT Network Administrator will troubleshoot complex network issues, lead infrastructure projects, monitor network performance, implement security controls, and provide technical leadership and mentoring to junior IT staff.

Key Responsibilities

• Design, configure, maintain, and troubleshoot enterprise LAN/WAN network infrastructure.
• Administer and support routers, switches, firewalls, wireless networks, VPNs, and network monitoring systems.
• Manage network security, including firewall policies, access controls, segmentation, IDS/IPS, and secure remote access.
• Monitor network performance, availability, capacity, and security using appropriate monitoring and management tools.
• Diagnose and resolve complex network connectivity, routing, switching, DNS, DHCP, and performance issues.
• Configure and maintain VLANs, routing protocols, VPNs, QoS, NAT, and network access controls.
• Plan and execute network upgrades, migrations, expansions, and infrastructure improvement projects.
• Maintain network documentation, diagrams, configurations, procedures, and disaster-recovery documentation.
• Implement network redundancy, high availability, backup connectivity, and disaster-recovery solutions.
• Collaborate with cybersecurity, systems, cloud, application, and help-desk teams to resolve infrastructure issues.
• Support cloud networking environments such as Microsoft Azure and/or AWS.
• Manage network-related vendors, service providers, contracts, and technical escalations.
• Conduct capacity planning and recommend improvements to network architecture and technology.
• Participate in incident response, root-cause analysis, and post-incident reviews.
• Establish and maintain network standards, policies, and best practices.
• Provide technical guidance and mentorship to network administrators and other IT staff.
• Participate in an on-call or after-hours support rotation when required.

Required Qualifications

• 5+ years of experience in network administration or network engineering.
• Strong knowledge of TCP/IP, DNS, DHCP, VLANs, routing, switching, NAT, VPN, and network security.
• Hands-on experience with enterprise routers, switches, firewalls, and wireless infrastructure.
• Experience with network monitoring and troubleshooting tools.
• Strong knowledge of network security principles and best practices.
• Experience with Windows and/or Linux server environments.
• Experience supporting hybrid on-premises and cloud network infrastructure.
• Strong analytical, troubleshooting, and problem-solving skills.
• Excellent communication and documentation skills.
• Ability to manage multiple projects and priorities independently.

Preferred Qualifications

• CCNA, CCNP, Network+, Security+, or equivalent certifications.
• Experience with Cisco, Fortinet, Palo Alto, Aruba, Juniper, or similar enterprise technologies.
• Experience with Microsoft Azure and/or AWS networking.
• Knowledge of SD-WAN, SDN, NAC, Zero Trust, and network automation.
• Experience with PowerShell, Python, Ansible, or other network automation technologies.
• Experience with ITIL-based service management.
• Bachelor’s degree in Information Technology, Computer Science, Networking, or a related field.

Key Skills

Networking: TCP/IP, LAN/WAN, VLAN, STP, OSPF, BGP, VPN, QoS, NAT, DNS, DHCP
Security: Firewalls, IDS/IPS, NAC, MFA, network segmentation, Zero Trust
Infrastructure: Cisco, Fortinet, Palo Alto, Aruba, Juniper, wireless networks
Cloud: Microsoft Azure, AWS, hybrid networking
Tools: Network monitoring, packet capture, configuration management, ticketing systems
Automation: PowerShell, Python, Ansible
Professional: Leadership, troubleshooting, communication, documentation, project management

Pay: $78,000.00-$85,000.00 per year

Benefits:

• Casual dress
• Dental care
• Employee assistance program
• Life insurance
• On-site parking
• Vision care

Ability to commute/relocate:

• London, ON: reliably commute or plan to relocate before starting work (required)

Application question(s):

• Are you located in the London \ St Thomas area?

Experience:

• Network administration: 7 years (preferred)

Language:

• English (required)

Work Location: In person