Senior Network and Security Engineer

Salary: £62,000 - 102,000 per year

Requirements:

• 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

Responsibilities:

• Design, implement and maintain our 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 our policies, procedures and compliance obligations

Technologies:

• Cloud
• Cisco
• Support
• LAN
• Network
• Nexus
• Security
• VPN

More:

CMC Markets is looking for an experienced Senior Network & Security Engineer to join our Technology team. This role is key to supporting our global network infrastructure and critical trading platforms in a fast-paced, regulated environment. You will work across both project delivery and business-as-usual operations, and we offer a collaborative environment where reliability, security and performance are critical. The role is based in London and is full time. We are an equal opportunities employer and positively encourage applications from suitably qualified and eligible candidates regardless of gender, sexual orientation, marital or civil partner status, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability or age.

last updated 35 week of 2026