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Sr. Director, Network Security Engineering

Job in Mississauga, Ontario, Canada
Listing for: McKesson
Full Time position
Listed on 2026-02-16
Job specializations:
  • IT/Tech
    Cybersecurity, Systems Engineer, Network Security, Cloud Computing
Job Description & How to Apply Below

Sr. Director, Network Security Engineering

Position Summary
The Sr. Director, Network Security Engineering is a visionary leader responsible for safeguarding the confidentiality, integrity, and availability of McKesson’s IT infrastructure. This role drives the development and execution of enterprise-wide network security strategies, collaborating across Core, Edge Cyber, and IT Operations to ensure robust protection against evolving threats. The director partners with business and technology stakeholders to define, document, and implement security standards, architectures, and best practices, while continuously optimizing infrastructure performance and resilience.

Key Responsibilities

Strategic Leadership & Vision

  • Lead and inspire a team of architects and engineers to deliver scalable, flexible, and cost-effective enterprise network and firewall security solutions.

  • Shape and communicate a strategic roadmap for network security, anticipating future technology requirements and aligning them with organizational goals.

  • Foster a culture of innovation, continuous improvement, and proactive risk management within the security engineering function.

  • Oversee and manage the network security budget for each fiscal year, aligning resource allocation with market trends, industry benchmarks, and evolving threat landscapes to ensure optimal investment in infrastructure resilience and compliance.

  • Architecture & Solution Delivery

  • Design and implement robust, future-ready network security architectures that meet performance, scalability, and compliance requirements.

  • Integrate Zero Trust principles, micro-segmentation, and identity-based controls across hybrid and multi-cloud environments (AWS, Azure, Google Cloud, OCI).

  • Oversee the deployment and management of advanced security technologies, including firewalls (Palo Alto, F5), Zscaler (ZIA & ZPA), Network Access Control (NAC), and intrusion prevention systems.

  • Collaboration & Stakeholder Engagement

  • Partner with IT, business, and cybersecurity teams to understand needs, define objectives, and deliver solutions that support enterprise priorities.

  • Build strong relationships with leadership and cross-functional teams, communicate strategic recommendations, and provide technical guidance.

  • Coordinate with peers to define cases, goals, and architectures that support business transformation and operational excellence.

  • Operational Excellence

  • Optimize network and firewall performance, ensuring minimal downtime and maximum efficiency.

  • Lead infrastructure security evaluations, testing, and incident response, driving continuous improvement in security posture.

  • Troubleshoot and resolve complex network and firewall issues, leveraging advanced diagnostics and automation.

  • Minimum Requirements
    10+ years of professional experience with at least 5 years in a supervisory or management.

    Governance & Compliance

  • Develop, document, and enforce IT infrastructure security standards, policies, and procedures.

  • Ensure alignment with regulatory requirements, industry best practices, and internal audit findings.

  • Manage inventory and policy standards for enterprise firewalls, VPNs, and network devices.

  • Talent Development & Mentorship

  • Provide technical leadership, coaching, and mentorship to team members, fostering professional growth and knowledge sharing.

  • Champion diversity, equity, and inclusion within the security engineering organization.

  • Qualifications

  • Bachelor’s degree in Computer Science, Information Technology, or related field; advanced degree is a plus.

  • 10+ years of progressive experience in network security architecture and engineering, including leadership roles.

  • 7+ years leading enterprise network and firewall security architecture, integrating LAN/WAN, VPN, and cloud solutions.

  • Deep expertise in network protocols, routing, switching, firewalls, Zscaler, NAC, and cloud security platforms.

  • Proven track record implementing Zero Trust architectures and advanced security controls.

  • Experience with automation and orchestration (Python, Terraform, Ansible) is highly desirable.

  • Relevant certifications (e.g., CISSP, PCNSE, ZCCP, CCSP, Azure Security) are a plus.

  • Exceptional problem-solving, communication, and…

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