Senior Network Engineer

Location: Halton

Senior Network Engineer / L3 Network Engineer (Security‑Focused)

Warrington, UK (Hybrid – 4 days onsite, 1 day remote)
Total Package: £64,000 – £65,000
Monday–Friday | No nights or weekends | 1-in-4 on‑call

About the Role

We’re looking for an experienced Senior Network Engineer with a strong security focus to join a technically driven, customer‑facing managed services team.

This is a true L3 role, where you’ll act as a senior escalation point for complex network and security incidents, work directly with customers, and help shape how enterprise networks are designed, secured, and operated. You’ll be hands‑on with modern Cisco technologies across LAN, WAN, SD‑WAN, wireless, and security, and play a visible role in improving service quality, stability, and automation.

If you enjoy solving difficult problems, mentoring others, and working in an environment where technical excellence is genuinely valued, this is a role where you can make a real impact.

Who We Are

We’re a specialist network infrastructure and managed services provider, trusted by organisations across sectors such as logistics, manufacturing, retail, hospitality, public sector, and chemical industries.

As a Cisco partner, we focus on intent‑based networking and helping customers move away from reactive, break‑fix operations towards secure, resilient, and intelligent network environments. Our work spans everything from structured cabling and passive optical LAN through to enterprise switching, SD‑WAN, wireless, and network security.

Our managed services practice is where we truly differentiate. We support customers running mission‑critical networks, act as master systems integrators on large automation projects, and help organisations address skills gaps while improving visibility, reliability, and security.

You won’t be joining a large corporate machine — you’ll be part of a collaborative, highly technical team where your voice is heard, your growth is supported, and your expertise matters.

What You’ll Be Doing

L3 Network & Managed Services Support

* Act as L3 escalation for complex issues across LAN, WAN, SD‑WAN, and hybrid cloud environments

* Support multiple customer networks in a fast‑paced MSP environment

* Work across multi‑vendor infrastructures, primarily Cisco, with exposure to Fortinet and Juniper

* Support onboarding, migrations, and network transformation projects

Security Operations (Client‑Facing)

* Troubleshoot and manage firewalls, VPNs, WAFs, IDS/IPS

* Investigate and respond to real‑time security alerts and incidents

* Ensure customer environments align with security policies, standards, and compliance frameworks

Incident, Problem & Change Management

* Serve as the final escalation point for P1 / P2 incidents

* Lead incident bridges with customers and internal teams

* Perform root cause analysis (RCA) and produce clear, client‑facing reports

* Implement changes in line with ITIL‑based change management

Service Delivery & Continuous Improvement

* Ensure incidents and requests meet SLA / OLA commitments

* Provide technical input into service reviews and reporting

* Identify opportunities for automation, optimisation, and service improvement

Proactive Monitoring & Optimisation

* Analyse monitoring alerts to prevent customer impact

* Fine‑tune monitoring thresholds per environment

* Optimise performance, availability, capacity, and security posture

Automation, Documentation & Mentoring

* Develop scripts and automation for repetitive operational tasks

* Contribute to configuration standardisation across clients

* Maintain high‑quality documentation and runbooks

* Mentor L1/L2 engineers and support their technical development

What We’re Looking For

Core Technical Skills

CCNP Enterprise / Security (or equivalent hands‑on experience)

Strong enterprise Cisco firewall experience (FTD/FMC)

Hands‑on knowledge of Cisco ISE, DNAC, SDA, and SD‑WAN

Advanced networking fundamentals: TCP/IP, routing & switching (BGP, OSPF, MPLS, VLANs, STP)

Experience with SD‑WAN solutions (Viptela, Meraki, Fortinet)

Exposure to cloud networking (AWS, Azure, GCP)

Experience with monitoring tools such as Zabbix

Security & Compliance

* Strong grasp of network security principles

* Experience…