Tower Lead Cyber Security / Windows Defender Location: Calgary, AB Work Arrangement: Onsite Job Type: Contract / Full-Time Job Summary We are seeking an experienced

Cyber Security Tower Lead / Windows Defender Architect

to lead enterprise security operations and endpoint protection initiatives. The ideal candidate will have expert-level knowledge of

Microsoft Windows Defender

and strong experience leading cybersecurity tool towers in complex enterprise environments.

Key Responsibilities Lead the

Cyber Security Tools Tower

and provide technical leadership for endpoint security initiatives. Act as the

Windows Defender Architect / SME , providing expert guidance on Microsoft Defender solutions. Design, implement, and optimize Windows Defender security solutions across enterprise environments. Lead security tool strategy, architecture, deployment, configuration, and ongoing optimization. Monitor and improve endpoint protection, threat detection, incident response, and security posture. Collaborate with Cyber Security, Infrastructure, Network, Cloud, and Operations teams. Provide technical leadership, troubleshooting, and resolution of complex security issues. Establish security standards, best practices, governance, and operational procedures.



Lead security tool upgrades, migrations, integrations, and technology transformation initiatives. Mentor technical teams and provide expert-level guidance on Microsoft Defender technologies. Prepare technical documentation, architecture diagrams, operational procedures, and reports.

Required Skills & Qualifications 7+ years of experience in Cyber Security / Endpoint Security / Security Engineering. Expert-level experience with

Microsoft Windows Defender / Microsoft Defender . Robust experience as a

Windows Defender Architect / Technical Lead / SME . Proven experience leading a

Cyber Security Tools Tower

or similar security technology function. Strong understanding of endpoint protection, threat detection, EDR/XDR, and security monitoring. Experience with enterprise-scale security architecture, implementation, and troubleshooting. Robust leadership, stakeholder management, and communication skills. Ability to work

onsite in Calgary, AB .

Preferred Certification Microsoft Defender / Windows Defender certification

or relevant Microsoft Security certification is highly preferred.

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📌 Senior Identity Management Specialist to design and implement enterprise identity solutions using (Winnipeg)
🏢 S.i. Systems
📍 Winnipeg