Network Security Engineer III (UK NetSec Pod)

Rackspace Technology is a leading provider of expertise and managed services across all the major public and private cloud technologies. We’ve evolved Fanatical Support to encompass the entire customer journey — providing Fanatical Experience™ from first consultation to daily operations. Our passionate experts combine the power of proactive, always-on service and expertise with best-in class tools and automation to deliver technology when and how our customers need it.

We are seeking experienced Network Security Engineers (Level III) to join our infrastructure team. This role requires significant experience in the security space for someone who can seamlessly navigate traditional hardware, software-defined networking, and advanced load-balancing solutions. You will be the primary architect and administrator for our high-availability security stack, with a specific focus on Cisco (ASA/Firepower/ISE), Palo Alto, F5 BIG-IP, and VMware NSX.

We have three roles available:

- 1st shift: 12:00–23:00, Friday to Monday (4 days per week)

- 2nd shift: 19:00–06:00, Friday to Monday (4 days per week)

- 3rd shift: 03:00–14:00, Friday to Monday (4 days per week)

Key Responsibilities:

• Multi-Vendor Firewall Management: Lead the migration, configuration, and maintenance of Cisco ASA (Classic) and Firepower (FTD) systems, while managing a robust Palo Alto environment via Panorama.
• Application Delivery & Security: Design and manage F5 BIG-IP solutions, focusing on LTM (Local Traffic Manager) for load balancing and ASM/WAF (Application Security Manager) for protecting web applications.
• Software-Defined Networking (SDN): Implement and manage micro-segmentation policies and virtualized security services within VMware NSX (T/V) environments.
• Legacy to Next-Gen Migration: Architect strategies to transition legacy Cisco ASA rulesets to Cisco Firepower or Palo Alto NGFWs without service disruption.
• Tier 3 Support: Act as the highest escalation point for complex network outages, security breaches, or performance degradation across the global fabric.
• Provide exceptional customer support via the phone and ticketing system
• Own level-appropriate customer requests and issues, seeing them through to resolution
• Own support escalations from other engineers and support teams according to escalation procedures
• Collaborate with Service Delivery Managers and Account Executives to build strong customer relationships
• Work closely with customers in the pre-implementation process to design and architect desired customer solutions.
• Work closely with the implementation team to quality check deployments and perform initial vulnerability assessment as part of the customer environment acceptance process.
• Research, plan and coordinate complex maintenance activities
• Participate in Root Cause Analysis (RCA) exercises to drive process & technology improvements.
• Collaborate and share knowledge with other administrators and engineers via articles and training presentations
• Contribute to the development of technical best practices for administrative responsibilities
• Prepare and review defined policy and process standards
• Ability to communicate effectively, both verbally and in writing, with customers as well as with internal stakeholders. Including preparing and presenting to customers electronically as well as on-site.
• Must be able to work a flexible schedule, 24x7x365 coverage, including holidays and weekends

Technical Skills & Qualifications:

• Cisco Specialist: Advanced knowledge of Cisco ASA (CLI/ASDM) and Firepower Threat Defense (FTD) managed via FMC.
• Palo Alto Expert: Deep experience with Palo Alto NGFW features (App-ID, User-ID, SSL Decryption).
• Load Balancing: Proficiency in F5 BIG-IP, including iRules development, SSL offloading, and traffic steering.
• Virtualization: Hands-on experience with VMware NSX, specifically in configuring distributed firewalls (DFW) and edge gateways.
• Protocols: Mastery of TCP/IP, BGP, OSPF, and deep packet inspection.

Certifications:

• CCNP Security – Required.
• CCIE Security – Highly Preferred.
• Specialist certifications in Firepower or ASA are a significant plus.
• PCNSE (Palo Alto Networks Certified Network Security Engineer) – Highly Preferred.
• F5-CTS (Certified Technology Specialist) – Preferred
• VCP-NV (VMware Certified Professional - Network Virtualization) – Preferred

Experience:

• Advanced level experience in network security engineering.
• Demonstrated experience managing complex firewall rule bases (10,000+ rules) across disparate platforms.
• Expertise in troubleshooting complex asymmetric routing issues and application-level latency in a multi-vendor environment.

About Rackspace Technology

We are the multicloud solutions experts. We combine our expertise with the world’s leading technologies — across applications, data and security — to deliver end-to-end solutions. We have a proven record of advising customers based on their business challenges, designing solutions that scale, building and managing those solutions, and optimizing returns into the future. Named a best place to work, year after year according to Fortune, Forbes and Glassdoor, we attract and develop world-class talent. Join us on our mission to embrace technology, empower customers and deliver the future.

More on Rackspace Technology

Though we’re all different, Rackers thrive through our connection to a central goal: to be a valued member of a winning team on an inspiring mission. We bring our whole selves to work every day. And we embrace the notion that unique perspectives fuel innovation and enable us to best serve our customers and communities around the globe. We welcome you to apply today and want you to know that we are committed to offering equal employment opportunity without regard to age, color, disability, gender reassignment or identity or expression, genetic information, marital or civil partner status, pregnancy or maternity status, military or veteran status, nationality, ethnic or national origin, race, religion or belief, sexual orientation, or any legally protected characteristic. If you have a disability or special need that requires accommodation, please let us know.