Network Engineer

Job Title: Network Engineer – Level 3 (L3) Network EngineerExperience: 6+ YearsJob SummaryThe Network L3 Engineer is a senior technical role responsible for the design, implementation, optimization, and advanced troubleshooting of complex enterprise networks, including LAN, WAN, Data Center, SD‑WAN, and Wireless infrastructures. The role serves as the final escalation point for critical incidents and provides architectural guidance, root cause analysis, and continuous improvement initiatives.The position requires strong expertise in Cisco enterprise networking, including SD‑WAN, routing, switching, wireless, Cisco ACI, in large‑scale, highly available, converged environments supporting voice, video, and data traffic.Key ResponsibilitiesAdvanced Operations & Escalation SupportAct as the Level 3 escalation point for complex and high‑impact network incidents.Perform deep technical troubleshooting and root cause analysis (RCA) for recurring or major incidents across wired and wireless networks.Ensure network stability, performance, and availability while meeting SLA and business continuity requirements.Provide technical leadership and guidance to L1 and L2 teams, including troubleshooting support and knowledge transfer.Network Design & ArchitectureDesign, review, and optimize enterprise campus, data center, WAN, and wireless network architectures.Lead architecture and deployment of:Cisco Wired & Wireless networksCisco SD‑WAN (Viptela)Cisco ACI for data center networkingDefine standards for network scalability, resiliency, redundancy, and security.Routing, Switching & WAN TechnologiesDesign, implement, and troubleshoot advanced routing and switching solutions using:BGP, OSPF, EIGRPMPLS (L2/L3 VPNs, WAN integration)STP, HSRP/VRRP, MulticastLead optimization of QoS policies to support real‑time voice and video traffic.Architect high‑availability and load‑balancing solutions across campus and WAN infrastructures.Wireless Networking & DNACDesign, deploy, and support enterprise‑grade wireless networks, including:Cisco Wireless LAN Controllers (WLC)Lightweight Access PointsPerform wireless site surveys, RF optimization, and capacity planning.Troubleshoot complex wireless issues related to:RF interferenceRoamingAuthenticationPerformance and coverageImplement and manage Cisco DNA Center (DNAC) features such as:Network provisioning and automationAssurance and health monitoringPolicy‑based segmentation (SD‑Access)Lead wired and wireless integration using DNAC‑driven workflows.Platforms & Vendor TechnologiesAdvanced hands‑on experience with:Cisco Nexus 9K / 7K / 5K / 2KCisco Catalyst 6500, 4500, 3750 seriesCisco enterprise routing platformsSupport and integrate multi‑vendor solutions including:HP networking devicesInfoblox DNS/DHCP/IPAMChange Management, Automation & ImprovementOwn and execute high‑risk and large‑scale network changes, including migrations, upgrades, and data center or campus refreshes.Review and approve change plans, ensuring proper design and rollback strategies.Drive network automation, standardization, and continuous improvement initiatives using DNAC and scripting approaches.Monitoring & Troubleshooting ToolsDesign and maintain enterprise monitoring strategies using:SolarWinds and SNMP‑based toolsConduct advanced packet‑level and RF analysis using:Wireshark and wireless diagnostic toolsTechnical Skills & KnowledgeExpert knowledge of OSI and TCP/IP modelsAdvanced expertise in:BGP, OSPF, EIGRP, MPLSSTP, HSRP/VRRP, MulticastQoS for converged networksStrong understanding of:Wireless LAN design and RF principlesCisco DNAC and SD‑AccessData center and enterprise campus networkingFamiliarity with network security integrations and policiesTools & TechnologiesCisco ACI, SDWAN, DNACNNMIWiresharkCisco WLC and Access PointsITSM tools (Incident, Change, Problem Management)Soft Skills & Leadership CompetenciesStrong technical leadership and mentoring abilitiesExcellent communication with technical and non‑technical stakeholdersAbility to work independently and with global, distributed teamsAnalytical mindset with proactive problem‑solving skillsWork EnvironmentLarge enterprise or service‑provider network environmentOn‑call support for critical outagesClose collaboration with architecture, security, operations, and vendor teams1. Network Operations & SupportMonitor and maintain enterprise LAN, WAN, WLAN, and SD-WAN environments.Perform Level 3 troubleshooting for network incidents and service requests.Diagnose connectivity issues involving routers, switches, firewalls, and wireless networks.Coordinate with Level 1 support and escalate complex issues to Level 3 engineers.2. Network Configuration & ImplementationConfigure and deploy:Cisco/Juniper switchesRoutersWireless Access Points (WAP)FirewallsVPN solutionsImplement VLANs, trunking, routing, and network segmentation.Support network migration and upgrade projects.3. Field Engineering ActivitiesVisit customer or branch locations for:Network installationsHardware replacementRack and stack activitiesCable management and patchingWireless site surveysPerform onsite troubleshooting and root cause analysis.4. Routing & SwitchingConfigure and troubleshoot:TCP/IPVLANsSTP/RSTP/MSTPOSPFBGPEIGRPHSRP/VRRPAnalyze routing tables and network traffic flows.5. Security ManagementSupport firewall administration.Configure ACLs and security policies.Manage VPN connectivity (Site-to-Site and Remote Access).Ensure compliance with enterprise security standards.6. Wireless Network SupportConfigure and maintain wireless controllers and access points.Troubleshoot Wi-Fi performance and coverage issues.Manage SSIDs, authentication, and roaming issues.7. Monitoring & Incident ManagementUse monitoring tools such as:SolarWindsPRTGCisco PrimeManageEngineNagiosRespond to network alerts and outages.Perform RCA (Root Cause Analysis) and prepare incident reports.8. DocumentationMaintain network diagrams and topology documents.Update configuration records and asset inventories.Create SOPs and operational documentation.9. Vendor CoordinationWork with ISP providers for circuit issues.Coordinate with OEM vendors such as Cisco, Aruba, Juniper, Fortinet, Palo Alto, and Check Point.Handle hardware RMA and support cases.10. Change & Problem ManagementExecute approved network changes.Participate in CAB (Change Advisory Board) activities.Follow ITIL processes for Incident, Problem, and Change Management.Disclaimer HCL is an equal opportunity employer, committed to providing equal employment opportunities to all applicants and employees regardless of race, religion, sex, color, age, national origin, pregnancy, sexual orientation, physical disability or genetic information, military or veteran status, or any other protected classification, in accordance with federal, state, and/or local law. Should any applicant have concerns about discrimination in the hiring process, they should provide a detailed report of those concerns to secure@hcltech.com for investigation.Compensation and BenefitsA candidate’s pay within the range will depend on their work location, skills, experience, education, and other factors permitted by law. This role may also be eligible for performance-based bonuses subject to company policies. In addition, this role is eligible for the following benefits subject to company policies: medical, dental, vision, pharmacy, life, accidental death & dismemberment, and disability insurance; employee assistance program; 401(k) retirement plan; 10 days of paid time off per year (some positions are eligible for need-based leave with no designated number of leave days per year); and 10 paid holidays per year.