Senior Core Network Engineer

Senior Core Network Engineer

Full-Time 55000 - 65000 £ / year (est.) No working from home possible
Modern Networks Ltd

At a Glance

  • Tasks: Ensure the stability and performance of our ISP core network while tackling complex technical challenges.
  • Company: Join Modern Networks, a growing IT Managed Service Provider with a focus on innovation.
  • Benefits: Enjoy a competitive salary, 25 days annual leave, and a strong work-life balance.
  • Other info: Support junior engineers and contribute to exciting engineering improvements in a dynamic team.
  • Why this job: Take ownership of technical problems and make a real impact in a live ISP environment.
  • Qualifications: Strong experience with ISP networking technologies and hands-on skills with Juniper platforms.

The predicted salary is between 55000 - 65000 £ per year.

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

About the Company

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.

Senior Core Network Engineer employer: Modern Networks Ltd

Modern Networks Ltd is an exceptional employer, offering a dynamic work culture that fosters innovation and collaboration in the heart of the UK. With a strong focus on employee growth, you will have the opportunity to mentor junior engineers while enhancing your own skills in a fast-paced ISP environment. The company prioritises stability and performance, ensuring that you are part of a team dedicated to continual improvement and excellence in network engineering.

Modern Networks Ltd

Contact Details:

Modern Networks Ltd Recruitment Team

We think you need these skills to ace Senior Core Network Engineer

BGP
MPLS
LDP
VRFs
L2VPNs
L3VPNs
PPPoE