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L3 Network & Security Operations Engineer
Marsh McLennanL3 Network & Security Operations Engineer managing cloud load balancing, WAN connectivity, and incident escalation for Marsh. Supporting global network and security operations across hybrid teams.
Core Competencies
Role fitCore Competencies
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Demonstrates extensive L3 Network Operations expertise, focusing on troubleshooting and managing load balancing services, including F5 Distributed Cloud and AWS Elastic Load Balancing. Proficient in ITIL-aligned change management and operational documentation, with a strong emphasis on cloud security controls and network connectivity.
Highest-signal resume keywords
L3 Network Operations ExperienceF5 Distributed Cloud Load BalancingAWS Elastic Load BalancingITIL Change ManagementTroubleshooting TCP/TLS and HTTP/HTTPS
ATS Keywords
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Hard Skills
L3 Network OperationsTroubleshooting L2–L7Load Balancing ImplementationTLS/SSL ManagementCisco Multilayer SwitchingWAN Connectivity TroubleshootingF5 BIG-IP Operational ExperienceScripting with PowerShellScripting with PythonCloud Security Controls
Soft Skills
Stakeholder CommunicationChange Management Discipline
Tools & Technologies
F5 Distributed CloudAWS ALB/NLBPrisma SD-WANAviatrixAruba CentralJuniper Mist
Industry Keywords
ITIL GovernanceIncident ManagementProblem ManagementChange ManagementZero TrustMicrosegmentation
Tech Stack
Tools & technologiesAWSCloudFirewallsITSMPythonSwitching
About the role
Key responsibilities & impact- Provide L3 escalation support for major incidents, leading technical triage, restoration activities, and stakeholder communication
- Operate, troubleshoot, and implement load balancing services, focusing on F5 Distributed Cloud and AWS Elastic Load Balancing (ALB/NLB)
- Manage TLS/SSL enablement across load balancers and, where required, firewalls/WAFs
- Support SD-WAN, WAN, and branch connectivity services
- Troubleshoot routing, pathing, carrier issues, and branch LAN/WLAN environments
- Deliver network changes through ITIL-aligned governance, including planning, risk assessment, validation, and rollback readiness
- Produce operational documentation, ITSM updates, and closure notes
- Support legacy F5 BIG-IP services during transition to cloud/distributed platforms
- Contribute to firewall, WAF, cloud security controls, Zero Trust, and microsegmentation capabilities
- Participate in weekday global follow-the-sun support and a shared weekend on-call rota for major incidents
Requirements
What you’ll need- Proven L3 Network Operations experience as a senior escalation resource in a NOC/operations environment
- Strong troubleshooting capability across L2–L7, including TCP/TLS and HTTP/HTTPS
- Hands-on experience with cloud/distributed load balancing, including F5 Distributed Cloud and/or AWS ALB/NLB
- Practical experience deploying and managing CA-provided certificates, including import/install, chain management, binding/configuration, renewal/rotation, and post-change validation
- Solid experience with Cisco multilayer switching (Layer 2 / Layer 3), including VLANs, SVIs, routing, and high-availability concepts
- Solid experience troubleshooting WAN and branch connectivity, including working with carriers and vendors during outages
- Strong change management discipline within an ITIL framework, including Incident, Problem, and Change processes
- Operational experience with legacy F5 BIG-IP (LTM) and/or migration activities to cloud/distributed load balancing platforms
- Familiarity with firewall and WAF implementations
- Experience with Prisma SD-WAN (CloudGenix), Aviatrix, Aruba Central, and/or Juniper Mist
- Scripting or automation experience using PowerShell and/or Python
Benefits
Comp & perks- Professional development opportunities
- Interesting work and supportive leaders
- Inclusive and flexible work environment
- Yearly budget and flexible benefits package of up to 20% of annual salary
- 30+ days off, including legal days, birthday, public holiday replacements, and benefits options
- Performance bonus scheme
- Matching charity contributions
- Charity days off
- Pay it Forward charity challenge
- Pension
- Life insurance
- Medical insurance
- Meal vouchers
- Travel insurance
- Flexible working remotely and in the office