About the Role / About the Job
The role involves maintaining the integrity and performance of network security systems, with a focus on F5 advanced WAF and BIG-IP load balancers. You will be responsible for identifying and organizing IP addresses, reviewing firewall policies, and ensuring all configurations align with high availability (HA) and disaster recovery (DR) requirements. The position requires a keen understanding of network security essentials, DNS governance, and the execution of secure operational changes without disrupting services.
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Key Responsibilities
- Deep technical experience with F5 advanced WAF.
- Identify and clean up unused or orphaned IP addresses on F5 BIG-IP load balancers to enhance performance, efficiency, and manageability.
- Review, validate, and eliminate unused, duplicate, or obsolete firewall policies across HQ and DR data centers while maintaining security posture and compliance.
- Ensure that firewall and load balancer changes comply with high availability (HA) and disaster recovery (DR) requirements.
Network & Security Assessment
- Perform comprehensive assessments of all devices, applications, databases, and network components that utilize public IP addresses.
- Analyze dependencies related to applications, services, and security to evaluate the potential impacts of changes to IP, firewall, and load balancer settings.
- Classify firewall rules and DNS-related entries based on their criticality, usage, activity level, and business relevance.
IP Addressing & DNS Governance
- Develop detailed cleanup and migration plans, including sequencing, timelines, backups, and rollback procedures.
- Design and allocate private IP address ranges, ensuring compatibility with existing network and security architecture.
- Assess and analyze DNS records to identify and rectify unused, outdated, or invalid entries related to applications and security controls.
- Update or remove invalid, obsolete, or unnecessary DNS records while ensuring no impact on applications or end users.
Secure Execution & Validation
- 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 ensure service availability, security enforcement, and performance stability.
Governance, Review & Documentation
- Establish periodic review procedures for firewall rules, F5 configurations, IP addressing, and DNS records to ensure ongoing accuracy and security.
- Ensure that 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.
Qualifications
- 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.
Education & Certifications (Preferred)
- Bachelor’s degree in Computer Science, Information Technology, or a related field.
- Certifications such as CCNP Security, F5-CA/CTS, NSE, or equivalent are highly regarded.
