cover image
Proactive.IT Appointments Ltd.

Senior Network Engineer

On site

London, United kingdom

£ 70,000 /year

Senior

Full Time

30-01-2026

Share this job:

Skills

Leadership Python Network Security Firewalls Splunk Monitoring Ansible Test Networking Research Architecture Security Architecture Enterprise Architecture

Job Specifications

Senior Network Engineer
Hybrid
This is a senior-level engineering role focused on enterprise network design, implementation, security and modernisation. The successful candidate will take ownership of complex infrastructure initiatives, working closely with architecture teams and senior stakeholders to deliver projects from concept through to full implementation.
The position requires strong technical leadership, hands-on engineering expertise, and the ability to manage multiple workstreams in a large, regulated enterprise environment. Key Responsibilities
Implement new network and network security technologies as defined by enterprise architecture.
Build, configure and test network infrastructure solutions across on-prem and cloud environments.
Contribute to the research and recommendation of innovative technologies to improve performance, resilience and scalability.
Engineer solutions using enterprise blueprints and standards.
Design and implement resilient architectures with disaster recovery and business continuity in mind.
Work with technologies including Switches, Routers, Firewalls, wireless platforms, SDN fabrics, load balancers, NAC and cloud networking components.
Provide Tier 3 engineering support for complex incidents and escalations.
Participate in a 24x7 on-call rotation as required.
Produce and maintain detailed network documentation using Microsoft Visio.
Maintain and continuously improve network security posture in line with regulatory frameworks including PCI-DSS, PII, CIS and NIST. Required Experience & Skills
5-7+ years of experience designing, implementing and supporting medium to large enterprise networks (10,000+ users).
Strong hands-on experience with Cisco enterprise technologies.
CCNP Enterprise (R&S) level knowledge required.
Solid understanding of:
Layer 2 technologies (STP, VLANs, VTP, LACP)
High availability designs (VPC, SVL, HSRP, VRRP)
Routing protocols (BGP, EIGRP, OSPF)
1-2 years' experience designing and supporting data centre spine-leaf fabrics (Cisco/Arista).
Arista ACE L3 certification required
Experience with Cisco DNA Center.
Experience with SD-WAN technologies (Cisco, Palo Alto ION).
Enterprise-scale Cisco Wireless experience (WLC, FlexConnect, CAPWAP). Desirable Experience
Palo Alto Firewall platforms (Pan-OS, Threat Prevention, User-ID, GlobalProtect, HA, Prisma Access).
F5 BIG-IP platforms (LTM, GTM, APM, ASM/Cloud WAF).
Remote access VPN technologies.
Certificate life cycle management (Venafi, PKI).
NAC solutions (Cisco ISE, Forescout).
Infoblox DNS/IPAM.
Cloud networking design and security principles.
Automation and Scripting (Python, Ansible).
Network monitoring tools such as SevOne, SolarWinds, Datadog or Splunk.
Knowledge of network security architecture, IDS/IPS, VPNs and SSL technologies.
Senior Network Engineer
Due to the volume of applications received for positions, it will not be possible to respond to all applications and only applicants who are considered suitable for interview will be contacted.
Proactive Appointments Limited operates as an employment agency and employment business and is an equal opportunities organisation
We take our obligations to protect your personal data very seriously. Any information provided to us will be processed as detailed in our Privacy Notice, a copy of which can be found on our website

About the Company

Welcome to Proactive.IT Appointments Ltd. With 30+ years of experience, Proactive.IT Appointments are at the forefront of the IT recruitment sector. Established in 1991, we have become the preferred partner for many Blue Chip national, global and Government organisations. Our dynamic team has built an unparalleled knowledge of the marketplace. Technology never stands still, so neither do we. We understand the industry trends and technological developments that matter most to our clients in an ever-changing market place, whi... Know more