Senior Network Security Specialist

Senior Network Security Specialist Shift Pattern

Standard 40 Hour Week (United Kingdom)

40

D - Assistant Vice President

(UK Division) Information Technology

UK-London

Permanent

The London Metal Exchange (LME) is the world centre for industrial metals trading. Most of the world's global non-ferrous futures business is conducted on the LME's three trading platforms totalling $21 trillion, 191 million lots and 4 billion tonnes notional with a market open interest high of 2.1 million lots in 2025.

The metals community uses the LME, an HKEX Group company, as a venue to transfer or take on price risk, as a physical market of last resort and as the provider of transparent global reference prices.

As a Senior Network Security Specialist, you will design, implement and govern the network security controls that protect our modern, high-performance enterprise network. You will take a hands‑on lead role in shaping the network security roadmap, defining policies and standards and driving the adoption of Zero Trust and micro‑segmentation across the organisation. Working within the Connectivity Engineering Team, you will collaborate closely with Information Security, Platform, Infrastructure and Application teams to ensure security is embedded by design.

Your expertise will be applied across on‑premises, cloud, and containerised environments, ensuring consistent and robust protection across all connectivity layers. You will also support the organisation's LAN, WAN, Campus and Data Centre network services, ensuring reliability, resilience, and high performance. You will maintain and develop core network standards across related systems, coordinate network activities across multiple technology projects, contribute deep technical expertise and produce both high‑ and low‑level designs.

As a subject‑matter expert, you will also provide 3rd‑line escalation support when required. This role reports directly to the Network Manager and may include participation in an on‑call rota, as well as occasional evening and weekend work. TOIL or overtime compensation will be available.

• Design, implement, and maintain enterprise network security controls including firewalls, proxies and secure access services aligned to business and regulatory requirements.
• Act as the technical authority for Fortinet, Palo Alto Networks and Zscaler platforms.
• Ensure security policies are consistently enforced across data centre, campus, cloud and hybrid environments.
• Lead complex troubleshooting of network security issues, balancing security, performance and availability.
• Own and define the network security roadmap, aligned with wider technology and security strategies.
• Design and evolve Zero Trust network architectures, including identity‑aware access and least‑privilege principles.
• Define and implement micro‑segmentation strategies for traditional and containerised workloads.
• Provide design input into new initiatives (cloud adoption, Kubernetes/Open Shift, automation, AI platforms).
• Evaluate new security technologies and patterns, producing clear recommendations and design artefacts.
• Develop and maintain network security standards, patterns and policy definitions.
• Ensure adherence to security policies through design reviews, operational controls and continuous improvement.
• Partner with Information Security to translate policy into enforceable technical controls.
• Support audits, risk assessments and regulatory obligations by providing clear evidence of control implementation.
• Act as a senior technical leader within the Network Team, mentoring engineers and setting best practice.
• Work closely with Infrastructure, Platform, and Application teams to embed security by design.
• Provide subject‑matter expertise to project teams and senior stakeholders.

The ideal candidate will have experience working within an ITIL‑governed environment and established infrastructure support frameworks. They will hold a bachelor's degree in Computer Science, Information Technology, or a related…