Senior Network Security Engineer

CMC Markets; Greater London; On-site; GBP 75,000 - 110,000; Full time

Benefits offered by this job

On-site in London

Job summary

CMC Markets is looking for an experienced Senior Network & Security Engineer to join the Technology team in London, onsite five days a week. You will design, build and support our global network infrastructure across on-prem and cloud environments, ensuring high performance, resilience and security for critical trading platforms in a regulated setting.

You will work across project delivery and BAU operations, implementing new network services, maintaining VPNs with external partners, and leading

Qualifications

• Extensive experience operating and troubleshooting Cisco ACI environments.
• Hands-on experience with multicast networking.
• CCNP-level networking knowledge or certification.
• Proven ability to design and build data centre and cloud networks.
• Solid knowledge of Cisco Catalyst and Nexus switch platforms.
• Excellent documentation, communication and stakeholder engagement skills.
• Experience supporting Market Data network feeds.
• Exposure to SD-WAN technologies.
• Experience supporting low-latency production networks within trading or financial services environments.
• Hands-on experience with Palo Alto firewalls and Cisco ASA / Meraki Wireless.

Responsibilities

• Design, implement and maintain CMC Markets’ global LAN, WAN and cloud network infrastructure.
• Deliver network engineering and design for new initiatives, alongside ongoing BAU growth and optimisation.
• Monitor network performance, capacity and availability, providing proactive support and troubleshooting.
• Implement new network services in line with internal policies, standards and security requirements.
• Identify, advise on and remediate network and security risks.
• Maintain secure VPN connectivity with external partners, ensuring alignment with current best practices.
• Perform BAU changes and troubleshooting on Palo Alto and Cisco ASA firewalls.
• Lead investigation and resolution of network and security incidents.
• Collaborate closely with internal technology teams to resolve connectivity issues.
• Maintain accurate technical documentation and diagrams.
• Ensure all work is delivered in line with CMC Markets’ policies, procedures and compliance obligations.

Skills

Cisco ACI

Multicast networking

CCNP level

Data centre networks

Cisco Catalyst/Nexus

Documentation/communication

Market Data feeds

SD-WAN

Low-latency networks (trading)

Palo Alto

ASA/Cisco Meraki Wireless

Tools

Palo Alto

Cisco ASA

Meraki Wireless

Job description

CMC Markets is looking for an experienced Senior Network & Security Engineer to join our Technology team. This role plays a key part in designing, building and supporting our global network infrastructure, ensuring high performance, resilience and security across on-premise and cloud environments.

This is an onsite role - 5 days in London

You will work across both project delivery and business-as-usual operations, supporting critical trading platforms in a fast-paced, regulated environment.

Key Responsibilities

• Design, implement and maintain CMC Markets’ global LAN, WAN and cloud network infrastructure
• Deliver network engineering and design for new initiatives, alongside ongoing BAU growth and optimisation
• Monitor network performance, capacity and availability, providing proactive support and troubleshooting
• Implement new network services in line with internal policies, standards and security requirements
• Identify, advise on and remediate network and security risks
• Maintain secure VPN connectivity with external partners, ensuring alignment with current best practices
• Perform BAU changes and troubleshooting on Palo Alto and Cisco ASA firewalls
• Lead investigation and resolution of network and security incidents
• Collaborate closely with internal technology teams to resolve connectivity issues
• Maintain accurate technical documentation and diagrams
• Ensure all work is delivered in line with CMC Markets’ policies, procedures and compliance obligations

Skills & Experience

• Strong experience operating and troubleshooting Cisco ACI environments
• Hands-on experience with multicast networking
• CCNP-level networking knowledge or certification
• Proven experience designing and building data centre and cloud networks
• Solid knowledge of Cisco Catalyst and Nexus switch platforms
• Excellent documentation, communication and stakeholder engagement skills
• Experience supporting Market Data network feeds
• Exposure to SD-WAN technologies
• Experience supporting low-latency production networks within trading or financial services environments
• Experience with Cisco ASA and Meraki Wireless
• Hands-on experience with Palo Alto firewalls

At CMC Markets, you’ll work with cutting-edge technology in a collaborative environment where reliability, security and performance are critical. If you’re passionate about networking and thrive in complex, high-availability environments, we’d love to hear from you.