Sr. Network Security Engineer
Skills
About This Role
The Job Description
- Identify and clean up unused or orphaned IP addresses on F5 BIG-IP load balancers to improve performance, efficiency, and manageability.
- Review, validate, and remove unused, duplicate, or obsolete firewall policies across HQ and DR data centers while maintaining security posture and compliance.
- Ensure firewall and load balancer changes are aligned with high availability (HA) and disaster recovery (DR)
requirements
- .
- Perform a comprehensive assessment of all devices, applications, databases, and network components using public IP addresses.
- Analyze application, service, and security dependencies to determine the potential impact of IP, firewall, and load balancer changes.
- Classify firewall rules and DNS-related entries based on criticality, usage, activity level, and business relevance.
- Design and allocate private IP address ranges, ensuring compatibility with existing network and security architecture.
- Assess and analyze DNS records to identify unused, outdated, or invalid entries related to applications and security controls.
- Remove or update invalid, obsolete, or unnecessary DNS records while ensuring no impact on applications or end users.
- Execute cleanup and migration activities in a secure, controlled, and auditable manner, ensuring uninterrupted service continuity.
- Coordinate with application, systems, SOC, and operations teams to align firewall rules, NAT, routing, DNS, and access controls.
- Perform post-change testing and validation to confirm service availability, security enforcement, and performance stability.
- Establish periodic review procedures for firewall rules, F5 configurations, IP addressing, and DNS records to ensure ongoing accuracy and security.
- Ensure cleanup activities do not negatively impact applications, services, or end users.
- Maintain comprehensive documentation for all activities, including changes implemented, issues encountered, root cause analysis, and approved remediation actions.
- Support audit, compliance, and regulatory requirements through proper documentation and change tracking.
- Develop detailed cleanup and migration plans including sequencing, timelines, backups, and rollback procedures.
Requirements
- Strong hands-on experience with firewalls (NGFW), security policies, NAT, and access control management.
- Proven expertise in F5 BIG-IP (LTM), including VIPs, Self IPs, SNATs, and HA configurations.
- Solid understanding of enterprise IP addressing, DNS, routing, and network security architecture.
- Experience operating in HQ / DR, high-availability, and mission-critical environments.
- Strong knowledge of change management, rollback planning, and risk mitigation.
- Bachelor s degree in Computer Science, Information Technology, or related field.
- Certifications such as CCNP Security, F5-CA/CTS, NSE, or equivalent are high.
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