L3 Network & Security Operations Engineer

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L3 Network & Security Operations Engineer

senior · Operations

Company:

Description:

We are seeking a talented individual to join our Network and Security Operations team, part of Marsh.
This role will be based in Cluj-Napoca. This is a hybrid role that has a requirement of working at least three days a week in the office.

As L3 Network & Security Operations Engineer you will act as a senior escalation point for complex network incidents and changes. This is an operational, delivery-focused role (troubleshooting, remediation, and implementation) with a strong emphasis on modern load balancing (F5 Distributed Cloud and AWS ALB/NLB), plus WAN and branch connectivity.

You will join a combined Network and Security Operations team that supports end-to-end user-to-application flows across the network and security control path. The position is primarily network-operations focused, with clear exposure and progression into security operations toolsets if desired.

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.