Senior Network Engineer

Proactive.IT Appointments Limited; Greater London; Hybrid; GBP 60,000 - 70,000; Full time

Job summary

A leading IT recruitment agency is seeking a Senior Network Engineer for a hybrid role in London. The position involves enterprise network design, security, and modernization. Candidates should possess significant experience with Cisco technologies and strong leadership skills. The ideal candidate will manage critical infrastructure projects and ensure network security in compliance with regulatory frameworks. This is a senior-level role offering competitive remuneration.

Qualifications

• 5-7+ years of experience in enterprise network design and implementation.
• Hands-on experience with Cisco technologies is essential.
• Experience with data centre spine-leaf fabrics is necessary.

Responsibilities

• Implement new network security technologies as per architectural guidelines.
• Engineer solutions in line with enterprise standards and requirements.
• Provide Tier 3 support for complex incidents.

Skills

Cisco enterprise technologies

Network security technologies

SD-WAN technologies

Network monitoring tools

Education

Arista ACE L3 certification

CCNP Enterprise (R&S)

Tools

Cisco DNA Center

Firewalls (Palo Alto)

F5 BIG-IP platforms

Job description

11404SJR £60k – 70k per year

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 24×7 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 lifecycle 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.

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