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Freedom Fibre Logo Freedom Fibre · IT - Administration

Layer 3 Network Engineer (Network Assurance Lead)

United Kingdom, Irlam · Job Posted April 02, 2026
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Job Description

Provide hands-on technical ownership of complex subscriber broadband faults across access, provisioning and CPE layers within an ISP/Wholesale environment. This is a deeply operational, execution‑focused role requiring expert diagnosis of end‑to‑end FTTP issues, structured evidence gathering, and effective engagement with third‑party BNG and wholesale providers.

Job Responsibility

  • Investigate complex FTTP subscriber faults end‑to‑end
  • Analyse DHCP session establishment and lease failures
  • Troubleshoot Radius authentication and attribute alignment
  • Validate subscriber state using third‑party BNG session tools
  • Investigate session drops, stale sessions, and re‑authentication behaviour
  • Validate VLAN tagging and access alignment
  • Diagnose IP addressing and allocation issues
  • Investigate MTU and fragmentation‑related faults
  • Perform WAN and LAN packet capture analysis
  • Deep‑dive into CPE routing, NAT and firewall behaviour
  • Investigate DNS resolution issues
  • Identify firmware‑related behavioural faults
  • Validate ACS / TR‑069 provisioning integrity
  • Diagnose Wi‑Fi performance issues (RSSI, airtime utilisation, interference)
  • Distinguish internal LAN issues from upstream network faults
  • Maintain and update technical knowledge base
  • Own and drive clear communication during major faults and escalations, providing structured updates to internal teams, suppliers, and stakeholders, ensuring transparency and alignment at all stages
  • Proactively build, maintain, and improve the technical knowledge base, ensuring repeat issues, fixes, and best practices are well documented and easily accessible across teams
  • Identify gaps in processes, tooling, and documentation, and work with internal teams and suppliers to implement improvements that reduce repeat faults and increase operational efficiency

Requirements

  • Strong broadband fault diagnostic experience (FTTP preferred)
  • Practical understanding of DHCP and Radius flows
  • Solid IP networking fundamentals
  • Experience working in an IPoE (DHCP‑based) broadband environment
  • Strong Wi‑Fi troubleshooting knowledge
  • Comfortable interpreting session data, logs, and diagnostic outputs
  • Experience working with third‑party BNG or Retail ISP/Wholesale providers
  • Ability to produce clear, structured technical escalations

Nice to have

  • CCNA‑level knowledge
  • Experience diagnosing firmware‑related issues
  • Experience with ACS / TR‑069 provisioning systems

What we offer

  • 25 days paid vacation
  • Flexible working hours
  • Hybrid working
  • Regular social & team events
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