Sr. Network Systems Engineer, Firewall

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

Benefits offered by this job

Hybrid or remote work

Job summary

McKesson in Canada is seeking a Senior Network Security Engineer to design, implement, and govern secure enterprise network infrastructure across cloud, data center, and hybrid environments.

You will drive Zero Trust architecture, network segmentation, firewall management (Palo Alto), and secure remote access while collaborating with cloud and platform teams to ensure scalable, compliant, and resilient network services across the business.

Qualifications

• Bachelor's degree or equivalent combination of education and experience.
• 7+ years of progressive experience in network security engineering or related roles.
• 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, 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.
• Perform security architecture reviews and provide recommendations for infrastructure modernization.
• Manage and optimize Palo Alto firewalls, security policies, and perimeter controls.
• Support Zscaler, Secure Internet Gateway, web proxy, and EdgeConnect technologies.
• Design and support secure remote-access solutions including ZTNA, VPN, and NAC.
• Monitor and analyze network traffic using IDS/IPS and security analytics tools.
• Collaborate with cloud, infra, and platform teams to ensure secure, scalable network services.

Skills

Zero Trust

Network segmentation

ZTNA

NAC

Palo Alto

IDS/IPS

Cloud networking

Terraform/Ansible/Puppet

Kubernetes security

Healthcare security

Education

Bachelor's degree

Tools

Palo Alto Networks

Zscaler

HPE Aruba EdgeConnect

SD-WAN

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.

Compensation

We are proud to offer a competitive compensation package at McKesson as part of our Total Rewards. This is determined by several factors, including performance, experience and skills, equity, regular job market evaluations, and geographical markets. The pay range shown below is aligned with McKesson's pay philosophy, and pay will always be compliant with any applicable regulations.

In addition to base pay, other compensation, such as an annual bonus or long‑term incentive opportunities may be offered.

Our Base Pay Range for this position $99,100 - $132,100

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.