Senior Network Engineer

We are looking for an experienced Senior Network Engineer to join an established network engineering team on an initial 3–6 month engagement.
The successful engineer will work alongside two existing senior network engineers, helping to share responsibility across both project delivery and operational support. This is a hands-on role requiring strong technical capability, particularly within low-latency network environments and Arista technologies.
The environment requires someone who can operate independently at a senior level, take ownership of network changes and project activity, and provide support for critical network infrastructure.
Key Responsibilities

Deliver network infrastructure projects from implementation through to production.
Support and maintain highly available, business-critical network environments.
Work with low-latency network infrastructure, ensuring performance, resilience and stability.
Configure, deploy and troubleshoot Arista networking technologies.
Plan and execute network changes, upgrades and migrations.
Diagnose and resolve complex network incidents and performance issues.
Work collaboratively with the existing senior network engineering team.
Participate in planned out-of-hours and weekend implementation/support work where required.
Produce and maintain appropriate technical and operational documentation.
Ensure network changes are delivered in a controlled manner with appropriate testing, validation and rollback planning.
Provide senior-level technical input into network design and implementation decisions.

Essential Skills & Experience

Strong experience working as a Senior Network Engineer in complex enterprise or mission-critical environments.
Demonstrable experience with low-latency networking.
Strong hands-on experience with Arista switches and Arista EOS.
Excellent understanding of core networking principles and protocols, including:

TCP/IP
BGP
OSPF
VLANs and switching
Routing
Multicast
Network resilience and high availability

Strong troubleshooting skills across Layer 2 and Layer 3 networking.
Experience delivering production network changes within controlled environments.
Ability to work autonomously and take ownership of technical issues through to resolution.
Experience balancing project delivery with operational/BAU support.
Comfortable working outside normal business hours when required for planned changes or support activity.
Experience of network desigin, implementation and support across the following network environments;

Financial services
Electronic trading
Market data
Trading infrastructure
High-frequency or low-latency environments

Experience with network automation, monitoring, performance analysis or infrastructure-as-code would also be beneficial.
SkillsEnvironments:Low Latency / High Frequency TradingMarket DataNetwork SecurityIT Infrastructure Expertise:High AvailabilityMarket Data DeliveryIT Infrastructure Products:Arista NetworksIT Infrastructure Technologies & Protocols:BGPFirewall PoliciesMulticast (PIM)OSPFRoutingSwitchingTCP/IPIT Network Expertise:Network DeploymentNetwork DesignNetwork Support