Overview We are seeking an

IT Infrastructure & Security Specialist

to join our IT Operations team. This role combines

cloud infrastructure management, cybersecurity operations, networking, and L1/L2 technical support .

The ideal candidate has strong experience managing

Microsoft 365, Azure, AWS infrastructure, networking, and enterprise systems , while also supporting internal users and maintaining secure, reliable IT operations in a rapid-growing organization. The role also plays an key part in maintaining Frontier’s

security posture , including security tooling, monitoring, and internal security awareness initiatives.

Key Responsibilities

Infrastructure & Cloud Operations

Administer and maintain

Microsoft 365 services

including Entra ID (Azure AD), Exchange Online, SharePoint, endpoint management, and security configurations.

Support and maintain

Azure and AWS cloud infrastructure , including virtual networks, access controls, system monitoring, and connectivity.

Manage VPN connectivity, networking infrastructure, firewalls, and virtual networks

to ensure secure and reliable connectivity across systems and users.

Maintain and

support SFTP servers and secure file transfer processes

used for business integrations.

Assist with maintenance, monitoring, and troubleshooting

SQL databases

supporting internal applications and integrations.

Administer and

support VoIP and cloud telephony platforms (such as RingCentral) , including user provisioning, call routing, integrations, and troubleshooting.

Cybersecurity

Administer and monitor

Microsoft Defender and other enterprise security platforms

used for endpoint, identity, and email protection.

Investigate security alerts, assist with incident response, and support vulnerability remediation and access management practices including MFA enforcement.

Help maintain Frontier’s overall

security posture





through monitoring, policy enforcement, and collaboration with leadership on security initiatives.

Lead internal security awareness initiatives , including employee security training programs and simulated phishing campaigns.

Coordinate with external security vendors to conduct periodic penetration testing and vulnerability assessments, including managing testing scope, scheduling, remediation tracking, and follow-up verification.

IT Support & Business Systems

Provide L1–L2 technical support

for employees across the organization, troubleshooting issues related to Microsoft 365, ERP, networking, and SaaS platforms.

Manage user provisioning, permissions, device setup, and access controls across enterprise systems.

Collaborate with internal teams to resolve system issues, improve reliability, and document processes and solutions.

Required Qualifications

5–7+ years of experience

in IT infrastructure, systems administration, or similar roles.

Hands-on experience administering

Microsoft 365 environments , including identity and security management.

Experience managing

Azure and AWS cloud infrastructure .

Strong knowledge of networking, VPNs, firewalls, and virtual networks.

Experience supporting IT Helpdesk / L1-L2 support in a business environment.

Experience maintaining SFTP servers and secure file transfer processes.

Experience with SQL database maintenance, backups, and troubleshooting.

Experience supporting ERP systems (preferably Acumatica) and other SaaS business applications.

Experience administering

Microsoft Defender or comparable enterprise security platforms .

Nice to Have

Experience with PowerShell or scripting for automation

Experience working in e-commerce environments

Experience supporting or maintaining infrastructure for chatbots, AI tools, or conversational platforms

Experience supporting or maintaining data warehouse infrastructure and data pipelines

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📌 IT Infrastructure & Security Specialist (Markham)
🏢 Frontier Dental
📍 Markham