Sr. Network Systems Engineer, Firewall

McKesson; Mississauga; Hybrid; CAD 137,000 - 183,000; Full time

Job summary

McKesson is seeking a Senior Network Security Engineer to lead the design, implementation, and governance of secure enterprise network infrastructure across cloud, data center, and hybrid environments. This role drives Zero Trust, segmentation, and advanced threat detection capabilities to support critical business operations.

The ideal candidate combines strong network engineering with a modern security mindset, building scalable, resilient security-ready infrastructure for McKesson’s

Qualifications

• 7+ years of progressive experience in network security engineering or related technical roles.
• Bachelor's degree or equivalent combination of education and experience.
• Hands-on experience designing and supporting enterprise network security architectures.
• Experience administering enterprise firewall platforms, including Palo Alto Networks.
• Experience with Zero Trust Architecture, network segmentation, and secure network design.
• Experience supporting VPN, ZTNA, NAC, or related identity-based network access technologies.
• Experience with IDS/IPS technologies, network traffic analysis, and security monitoring.

Responsibilities

• Lead the design and implementation of secure network architectures using Zero Trust principles.
• Develop and maintain network segmentation and micro-segmentation strategies to reduce attack surface and improve security posture.
• Perform security architecture reviews and provide technical recommendations for infrastructure modernization initiatives.
• Manage and optimize Palo Alto firewalls, network security policies, and perimeter defense controls.
• Support Zscaler, Secure Internet Gateway, web proxy, and HPE EdgeConnect technologies across enterprise environments.
• Design and support secure remote-access solutions including Zero Trust Network Access (ZTNA), VPN, and Network Access Control (NAC).
• Monitor and analyze network traffic using IDS/IPS technologies, threat detection platforms, and security analytics tools.
• Partner with cloud, infrastructure, and platform engineering teams to ensure secure, scalable, and compliant network services.

Skills

Zero Trust architecture

Network security engineering

Firewall administration

Security architecture reviews

IDS/IPS monitoring

Education

Bachelor's degree or equivalent

Tools

Palo Alto Networks

Zscaler

HPE EdgeConnect

Job description

McKesson is an impact-driven, Fortune 10 company that touches virtually every aspect of healthcare. We are known for delivering insights, products, and services that make quality care more accessible and affordable. Here, we focus on the health, happiness, and well-being of you and those we serve – we care.

What you do at McKesson matters. We foster a culture where you can grow, make an impact, and are empowered to bring new ideas. Together, we thrive as we shape the future of health for patients, our communities, and our people. If you want to be part of tomorrow’s health today, we want to hear from you.

About the Role

McKesson is seeking a Senior Network Security Engineer to lead the design, implementation, and governance of secure enterprise network infrastructure across cloud, data center, and hybrid environments. This role will drive the evolution of McKesson’s network security architecture through Zero Trust principles, segmentation strategies, secure access technologies, and advanced threat detection capabilities.

The ideal candidate combines strong network engineering expertise with a modern security mindset and the ability to build scalable, resilient, and compliant infrastructure that supports critical business operations.

What You’ll Do

• Lead the design and implementation of secure network architectures using Zero Trust principles.
• Develop and maintain network segmentation and micro-segmentation strategies to reduce attack surface and improve security posture.
• Perform security architecture reviews and provide technical recommendations for infrastructure modernization initiatives.
• Manage and optimize Palo Alto firewalls, network security policies, and perimeter defense controls.
• Support Zscaler, Secure Internet Gateway, web proxy, and HPE EdgeConnect technologies across enterprise environments.
• Design and support secure remote-access solutions including Zero Trust Network Access (ZTNA), VPN, and Network Access Control (NAC).
• Monitor and analyze network traffic using IDS/IPS technologies, threat detection platforms, and security analytics tools.
• Partner with cloud, infrastructure, and platform engineering teams to ensure secure, scalable, and compliant network services.

Minimum Requirements

• 7+ years of progressive experience in network security engineering, cybersecurity engineering, infrastructure engineering, or related technical roles.
• Bachelor's degree or equivalent combination of education and experience.
• Hands-on experience designing and supporting enterprise network security architectures.
• Experience administering enterprise firewall platforms, including Palo Alto Networks.
• Experience with Zero Trust Architecture, network segmentation, and secure network design.
• Experience supporting VPN, ZTNA, NAC, or related identity-based network access technologies.
• Experience with IDS/IPS technologies, network traffic analysis, and security monitoring.
• Ability to communicate technical concepts and influence security decisions across multiple teams.

Preferred Skills

• Experience with Zscaler, Secure Internet Gateway technologies, and web proxy solutions.
• Experience supporting HPE Aruba EdgeConnect or SD-WAN environments.
• Knowledge of micro-segmentation technologies in multi-cloud or hybrid environments.
• Experience securing cloud networking environments within AWS, Azure, or GCP.
• Knowledge of infrastructure automation tools such as Terraform, Ansible, or Puppet.
• Experience with Kubernetes, container security, and modern platform engineering practices.
• Experience working in healthcare or other highly regulated industries.
• Security certifications such as CISSP, PCNSE, CCNP Security, CCIE Security, Zscaler certifications, or equivalent.

Travel, Work Environment & Physical Requirements

• Hybrid or remote work arrangement based on business needs.
• Limited travel may be required for team collaboration, strategic planning sessions, or project implementation activities.
• Ability to work on a computer for extended periods and participate in virtual or in-person meetings.

Our Base Pay Range for this position

$99,100 - $132,100

McKesson job postings are posted on our career site: careers.mckesson.com.

For more information regarding benefits at McKesson, please click here.

McKesson is an Equal Opportunity Employer

McKesson provides equal employment opportunities to applicants and employees, without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability, age, genetic information, or any other legally protected category. For additional information on McKesson’s full Equal Employment Opportunity policies, visit our Equal Employment Opportunity page.

McKesson is committed to being an Equal Employment Opportunity Employer and offers opportunities to all job seekers including job seekers with disabilities. If you need a reasonable accommodation to assist with your job search or application for employment, please contact us by sending an email to (United States) [e-mail] or (Canada) [e-mail]. Resumes or CVs submitted to this email box will not be accepted.

Join us at McKesson!