Network L3 support Consultant

We are a $13+ billion global technology company, home to more than 224,000 people across 60 countries, delivering industry-leading capabilities centered around digital, engineering, cloud, and AI, powered by a broad portfolio of technology services and products.

HCLTech is a globally recognized leader in the Tech and IT industry, but we’ve never forgotten the startup mindset that got us here. We’ve always approached our work with an idea-first attitude because every one of our accomplishments —no matter how big or small —can be traced back to an idea’s single spark.

It’s that spark —that inner drive —that sets our people apart from our competitors. It enables us not just to pull off game-changing feat after game-changing feat but to better our world in the process. We want you to find your spark. Because that’s what drives you to be better, be more and ultimately, be more fulfilled.

To learn more about how we can supercharge progress for you, visit

Job Title: Network Consultant

Location: London, UK

Hybrid mode - 3 days work from office

This is Fixed term contract role FTC/FTE

Role Summary:

Routing & Switching

• Design, implement, and troubleshoot complex enterprise networks.
• Manage and support routing protocols including:
• BGP
• OSPF
• EIGRP
• Static Routing
• Route Redistribution
• Analyze routing issues and optimize network convergence and performance.
• Configure and troubleshoot ACLs, route maps, policy-based routing, and QoS.

Datacenter Network Operations

• Support large-scale datacenter environments utilizing:
• Cisco Nexus 5K/7K/9K
• Cisco ACI
• DCNM / NDFC
• VXLAN EVPN
• Spine-Leaf Architecture
• Perform datacenter migrations, refreshes, and transformation activities.
• Manage VLANs, VPC, STP, RSTP, MST, Port Channels, and multicast technologies.
• Provide expertise in Layer 2 and Layer 3 datacenter troubleshooting.

IPSEC & VPN Technologies

• Design and support Site-to-Site IPSEC VPN solutions.
• Troubleshoot:
• Phase 1 (IKE)
• Phase 2 (IPSEC)
• Tunnel establishment failures
• Encryption domain mismatches
• Routing over VPN tunnels
• Support:
• GRE over IPSEC
• DMVPN
• Extranet Connectivity
• B2B VPN Integrations
• Coordinate with firewall teams for VPN implementation and troubleshooting.

Incident & Problem Management

• Act as L3 escalation point for critical incidents and major outages.
• Lead RCA investigations and corrective actions.
• Provide technical leadership during Severity-1 incidents.
• Reduce recurring incidents through automation and process improvements.

Change & Project Delivery

• Evaluate and implement complex infrastructure changes.
• Participate in CAB reviews and risk assessments.
• Drive network modernization and cloud connectivity projects.
• Develop implementation plans, rollback strategies, and validation procedures.

Automation & Documentation

• Create SOPs, KT documents, and architecture diagrams.
• Leverage automation tools and scripting where applicable:
• Python
• Ansible
• Terraform
• Maintain network standards and governance documentation.

Required Technical Skills

Routing

• BGP,
• OSPF
• EIGRP
• MPLS
• VRF
• Policy Based Routing (PBR)

Datacenter

• Cisco Nexus
• Cisco ACI
• VXLAN EVPN
• Spine-Leaf Architecture
• VPC
• STP/RSTP/MST

VPN & Security

• IPSEC VPN
• IKEv1 / IKEv2
• GRE Tunnels
• DMVPN
• SSL VPN
• Route-based and Policy-based VPNs

Monitoring & Troubleshooting

• Wireshark
• Cisco Thousand Eyes
• NetFlow
• SNMP
• Syslog Analysis

Cloud Connectivity

• AWS Direct Connect
• Azure ExpressRoute
• Hybrid Cloud Networking