Network Contractor - Main Campus Network Redesign

Location: Cambridge - Onsite
Rate: £400-£440 per day, Inside IR35
Contract: Network Contractor
Working Pattern: Onsite, with planned evening/weekend change windows

We are seeking an experienced Network Contractor to support a major Main Campus Network Redesign and Remediation programme in Cambridge.

This is a hands-on role requiring strong Cisco routing and switching , enterprise campus networking, OSPF, BGP and wireless experience. You will work alongside existing network and infrastructure teams to improve network stability, resilience, supportability and configuration standards.

Key Responsibilities

- Review existing campus network topology and configurations.
- Identify and remediate legacy, redundant, inconsistent or obsolete configuration.
- Support network redesign and logical simplification.
- Configure and troubleshoot Cisco routers and switches.
- Troubleshoot complex Layer 2/Layer 3 connectivity and routing issues.
- Review and remediate VLANs, SVIs, trunks, port channels, routing and associated configuration.
- Support migration from legacy configurations to the agreed target design.
- Identify and remediate unused VLANs, interfaces, static routes, ACLs, prefix lists, route maps and unnecessary routing advertisements.
- Support Cisco wireless environments and troubleshoot basic Aruba networking/wireless issues.
- Prepare and implement controlled production network changes.
- Produce MOPs, implementation plans, rollback procedures and validation plans.
- Complete pre- and post-change testing and documentation.
- Produce accurate HLD/LLD, as-built, topology, routing and operational documentation.
- Work collaboratively with internal engineering teams while operating independently when required.

Technical Requirements

Cisco Routing & Switching

- Strong hands-on Cisco enterprise networking experience.
- Excellent Layer 2/Layer 3 and TCP/IP knowledge.
- VLANs, trunks, SVIs, port channels and Spanning Tree.




- Enterprise campus network design and resilient network architectures.
- Network configuration remediation and standardisation.

OSPF

- Practical configuration and troubleshooting experience.
- Neighbour relationships, areas, route advertisement and summarisation.
- Path selection, costs, default routes and redistribution.

BGP

- Working knowledge of eBGP/iBGP.
- Neighbour configuration and route advertisement.
- Prefix lists, route maps and filtering.
- Path selection, Local Preference, MED and AS Path.
- Troubleshooting BGP neighbour and routing issues.

Wireless

- Cisco Wireless LAN Controllers, APs, WLANs/SSIDs and VLAN integration.
- Enterprise wireless and client connectivity troubleshooting.
- Working knowledge of Aruba networking and/or wireless environments.

Change & Out-of-Hours Working

The contractor will participate in planned production changes and migrations, including:

- Change planning, risk assessment and implementation documentation.
- MOPs and rollback procedures.
- Pre/post-change validation.
- Troubleshooting during implementation.
- Planned evening and weekend maintenance windows.

Out-of-hours work will be agreed in advance wherever reasonably possible.

Essential Experience

- CCNA or demonstrable equivalent Cisco networking experience.
- Strong Cisco routing and switching background.
- Practical OSPF and working BGP experience.
- Enterprise campus network experience.
- Robust network troubleshooting skills.
- Experience cleaning up and standardising legacy configurations.
- Cisco wireless knowledge and Aruba networking/wireless experience.
- Experience working under formal change-control processes.
- Strong technical documentation skills.
- Ability to work onsite in Cambridge.
- Flexibility to support planned evening/weekend changes.

Desirable: CCNP-level knowledge, Cisco Catalyst experience, campus redesign/migration experience, mixed Cisco/Aruba environments, HLD/LLD experience and exposure to network automation or configuration management.

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📌 Network Engineer - CCNA/CCNP (Town of Cambridge)
🏢 CBSbutler
📍 Town of Cambridge