Senior Network Security Engineer — Enterprise Network Hardening

Comcast; West Chester (Chester County); On-site; USD 117,171 - 175,758; Full time

Job summary

Comcast is seeking an Engineer 4 to advance the security posture of core network platforms. This role can be based in West Chester, PA; Philadelphia, PA; or Mt.

Laurel, NJ, with on‑site collaboration preferred. You will own security roadmaps, lead remediation, and validate secure releases, working with architecture, cybersecurity, and vendor teams to ensure compliant, resilient networks.

Qualifications

• Bachelor's Degree in Computer Science, Information Technology, Cybersecurity, Network Engineering, or related field, or equivalent combination of education and experience.
• 5+ years of experience in Network Engineering, Network Security Engineering, Infrastructure Security, or related technical disciplines.
• 3+ years of hands‑on experience securing and supporting enterprise or service provider network environments.
• Experience with network platforms and technologies including Cisco, Juniper, Arista, Nokia, F5, Fortinet, or equivalent networking technologies.
• Hands‑on experience with routing and switching technologies.
• Knowledge of routing, switching, TCP/IP, DNS, DHCP, BGP, OSPF, MPLS, and network segmentation.
• Experience supporting PCI‑DSS, SOC 2, NIST, CIS Controls, or similar security frameworks.

Responsibilities

• Own the security posture and execution roadmap for Comcast network domains and platforms such as Cisco, Juniper, Arista, Nokia, F5, Fortinet etc.
• Lead vulnerability remediation, risk mitigation, and patch validation activities for critical vulnerabilities, and vendor security advisories.
• Validate secure software releases, compensating controls, and configuration changes in lab environments before production implementation, including security review, bug scrub, test case validation, and certification support.
• Drive secure configuration rollout and compliance enforcement across supported platforms using approved network security standards, audit tooling, ticketing workflows, and remediation tracking.
• Support audit readiness and closure for PCI, CGA, SOC 2, and internal compliance reviews by validating controls, documenting remediation plans, and coordinating evidence collection.

Skills

Network security engineering

Security risk assessment

Vendor coordination

Cross-functional collaboration

Troubleshooting

Education

Bachelor's degree in a related field

Tools

Cisco

Juniper

Arista

Nokia

F5

Fortinet

Job description

Comcast is seeking an Engineer 4 to advance the security posture of core network platforms. This role can be based in West Chester, PA; Philadelphia, PA; or Mt.

Laurel, NJ, with on‑site collaboration preferred. You will own security roadmaps, lead remediation, and validate secure releases, working with architecture, cybersecurity, and vendor teams to ensure compliant, resilient networks.