Salary: £55,000 - 65,000 per year Requirements: Strong experience working with ISP networking technologies, including BGP, MPLS, LDP, VRFs, L2VPNs, L3VPNs, PPPoE, OSPF, and IPv6 Extensive hands-on experience configuring and supporting Juniper MX and QFX platforms in a live production environment Proven ability to troubleshoot and resolve complex issues across a core network with a structured and methodical approach to fault finding Experience delivering network change, upgrades, and project work safely within a controlled production environment Good understanding of network performance, resilience, and operational best practice within an ISP or service provider setting Experience supporting core network services and related virtualised or Linux-based infrastructure would be beneficial Comfortable producing clear technical documentation and detailed change requests Able to work independently, take ownership of technical problems, and contribute to wider engineering improvements Experience with RADIUS and TACACS would be beneficial Able to support junior engineers and explain technical concepts clearly to non-technical stakeholders Exposure to automation and open-source tooling would be an advantage Responsibilities: Take responsibility for the stability, performance, and ongoing improvement of our ISP core network and supporting platforms Provide hands-on operational support across the core network and associated infrastructure Deliver technical projects and network changes safely in a live production environment Investigate, troubleshoot, and resolve complex technical issues as they arise Contribute to service improvements, automation, and wider engineering enhancements Work within the technical direction set by our Head of Technology & Engineering Produce clear technical documentation and detailed change requests Support and develop junior engineers Communicate technical concepts clearly to non-technical stakeholders Technologies: Support Linux MPLS Network More: We are Modern Networks, established in 2000, and we are a growing IT Managed Service Provider and Internet Service Provider specialising in services for the property management sector and commercial businesses nationwide. We work closely with our customers to deliver a wide range of IT services, from endpoint technology to connectivity and telephony, supported by partnerships with market-leading vendors. This is a hands-on senior technical role for an experienced network engineer who enjoys taking ownership, solving technical problems, and working in a live ISP environment. We offer great prospects, knowledgeable and experienced colleagues, a strong work-life balance, a commitment to diversity and inclusion, and 25 days annual leave plus bank holidays. last updated 24 week of 2026