SME - Network LAN/WAN
United Kingdom
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Job Description
SME - Network LAN/WAN
Greater London, England

Job Summary

Network Engineer

Key Responsibilities

Accountabilities • Provide 2nd line support for extranet and external connectivity services • Monitor, troubleshoot, and resolve connectivity, routing, firewall, and certificate issues • Support partner onboarding and offboarding, following approved patterns and procedures • Troubleshoot low latency connectivity and performance issues for latency sensitive services • Assist with BGP routing troubleshooting, including route visibility and failover scenarios • Investigate incidents, provide timely updates, and contribute to root cause analysis (RCA) • Work closely with Network, Security, and Application teams to resolve cross domain issues • Execute approved changes and maintenance activities • Maintain and follow runbooks, SOPs, and operational documentation • Participate in on call or shift based support (where applicable) • Automation, monitoring enhancements, capacity management, resiliency, business continuity management, front office specific support and stakeholder management

Skill Requirements

To be successful as an Extranet Networking Engineer, you should have: • Solid understanding of TCP/IP networking, routing, and DNS • Working experience with BGP & Arista (basic peering, route advertisement, and troubleshooting) • Working experience with Multicast • Working experience with networking Hardware • Exposure to low latency networking concepts, including: • Latency, packet loss, and jitter awareness • Path selection and basic performance troubleshooting • Hands on experience with firewall technologies, including: • Policy implementation and troubleshooting • NAT and access control rules • Experience supporting VPN technologies (IPSec, SSL, site to site) • Understanding of TLS/SSL and certificate management • Operational experience on Linux/Unix platforms • Ability to analyze logs, alerts, and basic packet captures • Familiarity with incident and change management processes

Other Requirements

Some other highly valued skills include: o Experience supporting external Client connectivity, Exchange Trading venue connectivity, multicast Market Data feeds. o Experience with CSO/CISO and third-party risk management o CCNP, CCDA, CISSP certifications o Experience with Network routing (BGP) and Precision time (PTP) protocols o Experience with scripting and Ansible automation tooling o Experience with Open-source based monitoring and logging tools such as Prometheus and Telegraf
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Information at a Glance

Why HCLTech?

At HCLTech, you'll supercharge your potential. You'll find your career. And you'll find your spark. All at a place that knows that helping its customers stay on top starts by putting its people first.

HCLTech is a global technology company, home to more than 223,000 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. We work with clients across all major verticals, providing industry solutions for Financial Services, Manufacturing, Life Sciences and Healthcare, Technology and Services, Telecom and Media, Retail and CPG, and Public Services. Consolidated revenues as of 12 months ending June 2026 totaled $14.8 billion.