Senior Network Security Engineer

Rackspace Technology

. Provide expert-level technical guidance to customers via phone, ticketing system, and automation .

Posted 10/27/2026full-timeCardiff • United KingdomSenior💰 £48,101 - £62,315 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in Networking and Network Security, with a strong focus on troubleshooting and configuring complex network environments. Proven ability to mentor others and provide exceptional customer support while adhering to security policies and standards.

Highest-signal resume keywords

Networking/Network Security ExperienceFirewall ConfigurationVPN TechnologiesNetworking Certification (CCNA/P)NSX-T Knowledge

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

TroubleshootingNetwork ConfigurationSecurity Solutions EngineeringLoad Balancer ManagementWindows/Linux System AdministrationCloud-Native ToolingAutomation ScriptingAccess-Control ListsVIP ConfigurationsTCL (iRule) and Perl Scripting

Soft Skills

Problem SolvingIndependent WorkMentoringCollaborationCustomer Experience Focus

Tools & Technologies

Rackspace Cloud ProductsRackConnectPalo AltoCisco FirePowerF5

Certifications & Qualifications

CCNACCNP

Industry Keywords

Network SecurityFirewallVPNNetwork SystemsSecurity PoliciesDocumentationMaintenance ActivitiesCustomer RelationshipsKnowledge SharingEscalation Management

Tech Stack

Tools & technologies

CloudFirewallsLinuxPerl

About the role

Key responsibilities & impact

Provide expert-level technical guidance to customers via phone, ticketing system, and automation
Own complex customer issues through resolution and keep customers updated
Troubleshoot customer network environments, including firewall configurations, VPN technologies, access-control lists, VIP configurations, TCL (iRule) and Perl scripts, and layer 4 through 7 issues
Advise customers on potential pitfalls and suggest automation-based alternatives
Support Rackspace Cloud products, including RackConnect
Provide customer experiences above expectations
Adhere to company security policies, procedures, and relevant standards
Configure, troubleshoot, and take escalations for firewalls, load balancers, Windows/Linux system administration, and cloud-native tooling
Create documentation for support and operations tasks
Configure, plan, install, maintain, and optimize network systems, equipment, and applications
Design, schedule, and coordinate maintenance activities
Engineer and implement customized security solutions
Collaborate with Account Managers and Business Development Consultants on customer relationships
Collaborate with Engineers and Administrators to share knowledge
Mentor and train lower-level Rackers

Requirements

What you’ll need

Proven experience (7+ years) in Networking/Network Security
Working knowledge of NSX-T, Palo Alto, Cisco FirePower, and F5
At least ONE relevant networking certification, e.g. CCNA/P
In-depth conceptual and practical knowledge in own job discipline
Basic knowledge of related job disciplines
Ability to solve complex problems
Ability to work independently with minimal guidance
May lead projects or project steps within a broader project
Acts as a resource for colleagues with less experience

Benefits

Comp & perks

Annual bonus or incentives
Equity awards
Employee Stock Purchase Plan (ESPP)
Benefits package (details not specified)
Equal employment opportunity
Disability or special-needs accommodation