SENIOR NETWORK ENGINEER

Job Description & Requirements Experience: 8–12+ years Domain: Enterprise Network Infrastructure & Security Job Summary We are seeking a highly experienced and hands-on Senior Network Engineer with strong expertise in enterprise routing & switching, network security, wireless, SD-WAN and production network operations. The candidate must have proven experience supporting large-scale, business-critical enterprise networks and should be capable of independently troubleshooting complex L2/L3 network incidents, performing root cause analysis, implementing network changes and coordinating with infrastructure, security, application, service-provider and vendor teams. This is a hands-on technical role. Candidates whose experience is primarily desktop support, service desk or basic network monitoring without strong configuration and troubleshooting experience will not be suitable. Key Responsibilities • Provide L2/L3 operational support for complex enterprise network environments. • Independently troubleshoot critical network incidents involving routing, switching, WAN, firewalls, VPN, wireless and network security. • Configure, implement, troubleshoot and maintain Cisco routers, switches, Nexus switches, WLCs, firewalls and enterprise network infrastructure. • Troubleshoot routing protocols including BGP and OSPF, along with HSRP, MPLS and related IP routing technologies. • Support Cisco ASA, Cisco Firepower/FMC, FortiGate and Palo Alto firewall environments. • Configure and troubleshoot IPSec VPN, SSL VPN, AAA, RADIUS and TACACS+. • Support Cisco ISE / Network Access Control (NAC) environments. • Support enterprise wireless infrastructure including Cisco WLC/Aironet and Aruba APs. • Support SD-WAN technologies such as Cisco SD-WAN/Viptela, VeloCloud, Fortinet SD-WAN and/or Meraki. • Perform advanced packet/network troubleshooting and isolate issues across network, application, security and service-provider layers. • Monitor network health and performance using SolarWinds, Zabbix, Nagios and similar enterprise monitoring platforms. • Perform Root Cause Analysis (RCA) for recurring and major network incidents and recommend permanent corrective actions. • Handle P1/P2 production incidents, escalations and restoration activities within defined SLA requirements. • Perform network configuration changes, upgrades, migrations, device replacements and infrastructure refresh activities. • Conduct network security reviews, identify vulnerabilities and implement appropriate remediation. • Participate in network design reviews and provide technical recommendations for scalability, availability, resilience and security. • Perform implementation validation and testing including FAT, SAT, UAT/OAT where applicable. • Coordinate with OEM vendors, telecom providers, security teams and other infrastructure teams for complex issue resolution. • Maintain accurate network diagrams, configurations, SOPs, troubleshooting guides and technical documentation. • Follow ITIL Incident, Problem, Change and Configuration Management processes. • Participate in scheduled maintenance, change windows and 24x7/on-call support where required. Mandatory Technical Requirements • 8+ years of hands-on experience in Enterprise Network Engineering and Network Operations. • Strong hands-on experience in L2/L3 Network Operations, Support and Troubleshooting. • Strong expertise in Cisco Routing & Switching in large-scale enterprise environments. • Strong knowledge of LAN/WAN networking, TCP/IP and enterprise network architecture. • Hands-on production experience with routing protocols including BGP and OSPF. • Good working knowledge of HSRP, MPLS, VLAN, STP and related switching/routing technologies. • Hands-on experience with Cisco Nexus switches. • Strong experience in Network Security and Enterprise Firewall technologies. • Hands-on experience with Cisco ASA, Cisco Firepower and FMC. • Good hands-on experience with FortiGate/Fortinet and/or Palo Alto firewalls. • Strong experience configuring and troubleshooting IPSec VPN and SSL VPN. • Strong knowledge of network authentication and security protocols including AAA, RADIUS and TACACS+. • Hands-on experience with Cisco ISE / Network Access Control (NAC) is preferred. • Strong experience with Enterprise Wireless Networks, including Cisco WLC/Aironet and/or Aruba. • Hands-on exposure to SD-WAN technologies, preferably Cisco Viptela, VeloCloud, Fortinet SD-WAN or Meraki. • Experience with enterprise network monitoring tools such as SolarWinds, Zabbix and Nagios. • Strong experience handling P1/P2 incidents, L2/L3 escalations and complex production network issues. • Proven ability to perform Root Cause Analysis (RCA) and implement permanent corrective solutions. • Strong understanding of Incident, Problem and Change Management processes in an ITIL environment. • Ability to independently configure, troubleshoot, implement and maintain enterprise network infrastructure, rather than only monitor and escalate incidents. • Strong communication skills with experience coordinating with customers, vendors, service providers, security teams and other infrastructure teams. Qualifications • Degree/Diploma in Computer Science, Information Technology, Network Engineering or related discipline. • Minimum 8 years of hands-on enterprise network engineering experience. • CCNA mandatory or equivalent practical expertise; CCNP preferred. • ITIL certification is an advantage. • Strong understanding of enterprise network architecture, security and high-availability environments. • Strong analytical and troubleshooting ability. • Ability to independently manage complex technical incidents from diagnosis through resolution. • Strong communication and documentation skills. • Experience working with enterprise customers, vendors and geographically distributed technical teams.