Senior Network Security Engineer

CompanyCMC Markets

LocationLondon Area, United Kingdom

Posted At1/13/2026

UK Visa Sponsorship Analytics

Occupation Type

Cyber security professionals

Occupation Code Skill LevelHigher Skilled

Sponsorship Salary Threshold

£48,500 (£24.87 per hour)

Occupation rate applies

Above analytics are generated algorithmically based on job titles and may not always be the same as the company's job classification. You can also check detailed occupation eligibility, and salary criteria on our UK Visa Eligible Occupations & Salary Thresholds page.

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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

Essential

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

Desirable

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.

CMC Markets is an equal opportunities employer and positively encourages 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.