Senior Network Specialist

JR United Kingdom; London; On-site; GBP 60,000 - 90,000; Full time

Job summary

A leading company in the UK is seeking an Expert DC & Security Engineer to manage the full lifecycle of network systems. This hands-on role involves designing and deploying complex networks, ensuring optimal performance, and collaborating with internal teams for continuous improvement. Candidates should have extensive experience in low-latency environments and a strong background in security and multicast technologies.

Qualifications

• Proven experience in enterprise-scale networks, especially in finance/trading.
• Deep knowledge of networking protocols (BGP, OSPF, etc.).
• Hands-on experience with Data Centre and SDN technologies.

Responsibilities

• Design, build, and maintain complex network systems.
• Provide expert support for multicast and WAN implementations.
• Maintain documentation and conduct performance reviews.

Skills

Low-latency networking

Multicast technologies

Secure data centre infrastructure

Network packet analysis

Firewall administration

Network automation principles

Tools

F5 BIG-IP

Palo Alto

Cisco ASA

CheckPoint

Job description

Social network you want to login/join with:

We are looking for an Expert DC & Security Engineer with deep expertise in low-latency networking, multicast technologies, and secure data centre infrastructure. This is a hands-on, high-impact engineering role where you’ll be responsible for the full lifecycle of network systems—from design and deployment to performance monitoring and continuous improvement.

Key Responsibilities

• Design, build, and maintain complex network systems and applications to meet evolving business and technical demands.
• Translate business requirements and performance data into robust technical solutions that align with capacity and infrastructure strategies.
• Develop real-time dashboards and monitoring systems to visualise network health and performance.
• Provide expert support for multicast and WAN implementations, acting as the primary escalation point for complex issues.
• Lead network upgrades and migrations, coordinating with internal teams and third-party providers.
• Manage enterprise firewall environments and contribute to secure network architecture reviews.
• Maintain thorough documentation and conduct detailed system performance reviews to drive continuous improvement.
• Contribute to engineering patterns, enabling the automation, testing, and deployment of network solutions within an SRE/DevOps framework.

Technical Requirements

• Proven experience working on enterprise-scale networks, particularly in latency-sensitive environments (finance/trading preferred).
• Deep knowledge of LAN, WAN, HSRP, NAT, MPLS, VPN, GRE, BGP, and OSPF protocols.
• Advanced expertise in multicast networking: PIM-SM, PIM-SSM, IGMP, MVPN, MLDP.
• Hands-on experience with F5 BIG-IP (LTM, GTM, etc.).
• Strong background in firewall administration and security: Palo Alto, Cisco ASA, CheckPoint, or similar platforms.
• Proficient with network packet analysis and troubleshooting using packet capture tools.
• Experience with Data Centre and SDN technologies: Cisco ACI, VxLAN, and related tooling.
• Understanding of network automation principles; exposure to SRE/DevOps practices is a plus.
• Working knowledge of TCP/IP and multicast in internet-facing architectures.