DeepSource Technologies
Information Technology and Services
SeniorNetworkSecurityEngineer
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optimal for Senior candidates.
“Senior Network Security Engineer at DeepSource Technologies. Skills: Network Security, F5 BIG-IP, Firewall Management, DNS Management. Identify and clean up unused IP addresses. Improve performance, efficiency, and manageability”
Industry & Context.
Root cause analysis
What They're Looking For.
Must Have
hands-on experience with firewalls, security policies, NAT, access control management, Proven expertise in F5 BIG-IP, VIPs, Self IPs, SNATs, HA configurations, Solid understanding of enterprise IP addressing, DNS, routing, network security architecture, Experience operating in HQ / DR, high-availability, mission-critical environments, knowledge of change management, rollback planning, risk mitigation
Nice to Have
Bachelor’s degree in Computer Science, Information Technology, Certifications such as CCNP Security, F5-CA/CTS, NSE, equivalent
What You'll Do.
Identify and clean up unused IP addresses
and remove unused firewall policies
Maintain security posture and compliance
Ensure firewall and load balancer changes align with
Perform comprehensive assessment of devices
and security dependencies
Determine potential impact of changes
Classify firewall rules and DNS entries
Develop detailed cleanup and migration plans
Design and allocate private IP address ranges
Assess and analyze DNS records
or invalid DNS entries
Remove or update invalid DNS records
Execute cleanup and migration activities securely
Ensure uninterrupted service continuity
Coordinate with application
Perform post-change testing and validation
Confirm service availability
and performance stability
Establish periodic review procedures
Ensure ongoing accuracy and security
Ensure cleanup activities do not negatively impact applications
Maintain comprehensive documentation
and regulatory requirements
How You'll Work.
Team & Collaboration
Coordinate with application teams; Coordinate with systems teams; Coordinate with SOC teams; Coordinate with operations teams
Process & Methodology
Migration planning, Rollback planning
Full Job Description
• Deep technical experience on F5 advanced WAF • 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. Network & Security Assessment • 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. **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 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. **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 confirm 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
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