Company:
Marsh
Description:
We are seeking a talented individual to join our Network Operations team at Marsh. This role will be based in Cluj-Napoca and follows a hybrid working model , with a requirement to work at least three days per week in the office.
As an L3 Network Operations Engineer , you will act as a senior escalation point for complex network incidents, service issues, and network changes.
This is a hands-on, operational and delivery-focused role with a strong emphasis on network troubleshooting, problem resolution, remediation, and implementation .
You will support enterprise network services across LAN, WAN, branch connectivity, WiFi, routing, switching, and on-premises network infrastructure . You will work closely with internal teams, carriers, vendors, and technology partners to restore services, implement changes safely, and improve network reliability.
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 complex network incidents and major service disruptions.
Lead technical triage, fault isolation, remediation, and service restoration activities.
Troubleshoot complex issues across LAN, WAN, branch connectivity, routing, switching, WiFi, and on-premises network infrastructure .
Investigate end-to-end connectivity issues affecting users, offices, branches, applications, and network services.
Troubleshoot issues across relevant network layers and protocols, including IP, TCP, DNS, DHCP, HTTP/HTTPS, and TLS where applicable to connectivity and service diagnosis.
Analyze network traffic flows, routing paths, interface behavior, and connectivity dependencies to identify root causes.
Support and troubleshoot WAN and branch connectivity services , including routing, pathing, latency, packet loss, carrier issues, circuits, and site-to-site communication.
Support branch LAN and WLAN environments, including local switching, wireless access, and site-level connectivity issues.
Support and troubleshoot enterprise WiFi/WLAN environments , including access points, controllers, switching dependencies, wireless connectivity, and performance-related issues.
Configure, support, and troubleshoot Cisco and Arista routers and switches .
Work with Cisco multilayer switching environments, including VLANs, trunking, Spanning Tree, SVIs, inter-VLAN routing, routing protocols, and high-availability configurations.
Support network resilience and failover activities across enterprise and branch environments.
Work with carriers, vendors, managed service providers, and technology partners during network outages and complex service issues.
Deliver network changes safely and effectively through ITIL-aligned governance.
Prepare implementation plans, risk assessments, validation steps, and rollback procedures.
Implement and support network upgrades, migrations, hardware replacements, connectivity changes, site deployments, and infrastructure improvements.
Perform pre-change checks, post-change validation, and service verification.
Participate in problem management activities and identify recurring issues and opportunities for permanent remediation.
Produce high-quality technical documentation, network diagrams, ITSM updates, incident records, problem records, implementation records, and closure notes.
Contribute to knowledge articles, troubleshooting procedures, technical standards, and continuous improvement initiatives.
Participate in structured handovers across global regions and ensure that relevant technical information is communicated clearly.
Communicate effectively with technical teams, service owners, business stakeholders, carriers,…