Marshall Wolfe
Principal Network Engineer
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Principal Network Engineer - Cisco Network Engineer
London (Hybrid – 60/40 split)
Permanent | Competitive Salary + Benefits
About the Opportunity
We’re partnering with an innovative full-fibre broadband provider transforming connectivity across London. This fast-growing organisation is delivering next-generation FTTP (Fibre to the Premises) infrastructure, enabling ultra-fast, reliable connectivity for homes and businesses.
They’re now looking for a Principal Network Engineer to play a pivotal role in shaping, scaling, and optimising a carrier-grade network in a high-performance, fast-paced environment.
The Role
As a Principal Network Engineer, you’ll act as a technical authority and escalation point, leading the design, delivery, and evolution of a cutting-edge network infrastructure.
This is a hands-on, project-focused role, where you’ll own initiatives end-to-end — from design and scoping through to implementation, optimisation, and ongoing support.
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You’ll also have the opportunity to mentor junior engineers and collaborate across key stakeholder groups, contributing to strategic network decisions.
Key Responsibilities
- Lead the design, delivery, and optimisation of network infrastructure projects
- Own the full project lifecycle from scoping to implementation and improvement
- Act as the final escalation point for complex network faults and issues
- Ensure network availability and performance meet strict SLA targets
- Design and implement scalable, resilient carrier-grade solutions
- Monitor network health and respond proactively to alarms and incidents
- Produce high-quality documentation (HLD, LLD, migration plans, procedures)
- Collaborate with internal teams, vendors, and stakeholders to deliver solutions
- Provide out-of-hours support as part of an on-call rota
- Mentor and support junior engineers
Skills & Experience Required
- Strong experience in network project delivery (ISP/telco environment preferred)
- Proven expertise with carrier-grade Cisco networking equipment
- Deep knowledge of:
- BGP, OSPF, IS-IS
- MPLS & MPLS VPNs
- IPv6, multicast networking
- Firewalls and network security
- Strong troubleshooting skills, including packet capture analysis
- Experience with network monitoring tools (e.g. SolarWinds, Nagios, PRTG)
- Ability to work autonomously and lead technical projects
- Experience producing detailed technical documentation
- Certifications:
- CCIE (Service Provider or Enterprise) or equivalent experience highly desirable
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Nice to Have
- Network security expertise
- Exposure to PON or fibre infrastructure environments
- Scripting/automation skills
- Experience with Software Defined Networking (SDN)
- Progress towards additional advanced certifications
Apply today or reach out for a confidential discussion to learn more about this opportunity.
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