Senior Network Security Engineer: Zero Trust & Firewall

McKesson; United States; Hybrid; USD 99,000 - 132,000; Full time

Job summary

McKesson is seeking a Sr. Network Systems Engineering, Firewall to lead design, implementation, and governance of secure enterprise network infrastructure across cloud, data center, and hybrid environments.

This role advances McKesson’s network security architecture, applying Zero Trust principles, segmentation, and secure access technologies to support critical operations. The ideal candidate combines strong network engineering with a security mindset and the ability to build scalable,

Qualifications

• 7+ years in network security or related engineering roles.
• Bachelor's degree or equivalent experience.
• Hands-on design and support of enterprise network security architectures.
• Experience administering enterprise firewall platforms (Palo Alto).
• Experience with Zero Trust, segmentation, and secure network design.
• Experience with VPN, ZTNA, NAC, or identity-based access technologies.
• Experience with IDS/IPS, traffic analysis, and security monitoring.
• Strong communication to influence security decisions across teams.

Responsibilities

• Lead secure network architectures design using Zero Trust.
• Develop and maintain segmentation and micro-segmentation strategies.
• Perform security architecture reviews and advise on modernization.
• Manage and optimize Palo Alto firewalls and policies.
• Support Zscaler, SG, web proxies, and HPE EdgeConnect.
• Design secure remote-access including ZTNA, VPN, NAC.
• Monitor network traffic with IDS/IPS and threat analytics.
• Collaborate with cloud, infra, and platform teams for secure services.

Skills

Zero Trust

Network security

Firewall management

Security architecture

Threat detection

IDS/IPS

Communication

Education

Bachelor's degree

Tools

Palo Alto firewalls

Zscaler

ZTNA

NAC

IDS/IPS

Job description

McKesson is seeking a Sr. Network Systems Engineering, Firewall to lead design, implementation, and governance of secure enterprise network infrastructure across cloud, data center, and hybrid environments.

This role advances McKesson’s network security architecture, applying Zero Trust principles, segmentation, and secure access technologies to support critical operations. The ideal candidate combines strong network engineering with a security mindset and the ability to build scalable,