L3 Network & Security Operations Engineer

Working pattern

Hybrid working model with an expectation of time in the office and time working from home

Standard business hours, Monday to Friday

Global follow-the-sun support model across EMEA, APAC, and the Americas, with structured handovers between regions

Weekend on-call rota for major incidents only; shared across the full team with each person covering one weekend per rotation cycle

We will count on you to

Provide L3 escalation support for major incidents, leading technical triage, restoration activities, and clear stakeholder communication

Operate, troubleshoot, and implement load balancing services, with a primary focus on F5 Distributed Cloud (XC) and AWS Elastic Load Balancing (ALB/NLB)

Manage TLS/SSL enablement across load balancers and, where required, firewalls/WAFs, including certificate installation, chain management, binding, renewal, rotation, and end-to-end validation

Support SD-WAN, WAN, and branch connectivity services, including troubleshooting routing, pathing, carrier issues, and branch LAN/WLAN environments

Deliver network changes safely and effectively through ITIL-aligned governance, including planning, risk assessment, validation, and rollback readiness

Produce high-quality operational documentation, ITSM updates, and closure notes to improve repeatability and reduce mean time to resolution

Support legacy F5 BIG-IP services as required during transition to cloud/distributed platforms

Contribute to the team’s broader operational capability, with opportunities to gain exposure to firewall, WAF, cloud security controls, Zero Trust, and microsegmentation technologies

Growth & development (security operations pathway)

Opportunity to develop hands-on experience with firewall and WAF implementations where traffic flows require termination/inspection and policy troubleshooting

Exposure to cloud security controls and segmentation (e.g., security groups and cloud-native access patterns) as part of end-to-end flow support

Option to broaden into Zero Trust and microsegmentation technologies used by the team (e.g., Zscaler, Elisity, Illumio), depending on interest and team needs

What you need to have

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, with a structured and methodical approach to fault isolation and remediation

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 configuration and troubleshooting of 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

What makes you stand out?

Operational experience with legacy F5 BIG-IP (LTM) and/or migration activities to cloud/distributed load balancing platforms.

Familiarity with firewall and WAF implementations, especially where TLS termination or inspection affects traffic flows.

Experience with Prisma SD-WAN (CloudGenix), Aviatrix, Aruba Central, and/or Juniper Mist.

Scripting or automation experience using PowerShell and/or Python to improve operational efficiency.

Why join our team

We help you be your best through professional development opportunities, interesting work, and supportive leaders;

We foster a vibrant and inclusive culture where you can work with talented colleagues to create new solutions and have an impact for colleagues, clients, and communities;

Our scale enables us to provide a range of career opportunities, as well as benefits and rewards to enhance your well-being;

A yearly budget and the opportunity to build your flexible benefits package (up to 20% of your annual salary);

30+ days off (including legal days, birthday, public holiday replacements, and benefits options);

Performance bonus scheme;

Matching charity contributions, charity days off, and the Pay it Forward charity challenge;

Core benefits: Pension, Life and Medical Insurance, Meal Vouchers, Travel Insurance.

Marsh (NYSE: MRSH) is a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of over $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information, visit marsh.com, or follow us on LinkedIn and X.

Marsh is committed to creating a diverse, inclusive and flexible work environment. We aim to attract and retain the best people and embrace diversity of age, background, disability, ethnic origin, family duties, gender orientation or expression, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, or any other characteristic protected by applicable law.

Marsh is committed to hybrid work, which includes the flexibility of working remotely and the collaboration, connections and professional development benefits of working together in the office. All Marsh colleagues are expected to be in their local office or working onsite with clients at least three days per week. Office-based teams will identify at least one “anchor day” per week on which their full team will be together in person.