Salary: £118,080 - 123,500 per year Requirements: Expertise in enterprise networking technologies, with essential experience in core LAN, MAN and WAN environments. Hands-on knowledge of core routing, switching and transport technologies, including IP networking, MPLS, segment routing, multicast, and VPNs. Knowledge of optical transport architectures across metro and long distance networks. Exposure to network automation tools and practices. Familiarity with network observability/troubleshooting tools such as SevOne, Splunk, NetScout, Wireshark, NDC, HPNA, NNMI, OBM, IBM Watson, NSO, etc. Experience engaging and collaborating with clients. Ability to take ownership of responsibilities and ensure alignment across teams. Desirable: Experience with SDN; Cisco ACI, VMware NSX, Arista CloudVision. Desirable: Previous experience in network design, deployment or operations. Bonus: Experience with automation tools such as Python, Ansible, Django for ticketing systems and network devices. Industry experience in the financial sector desired. Responsibilities: Plan and oversee the ongoing progress of the organisations core network and transport infrastructure in a high throughput routing environment. Support WAN routing, switching, and the transport infrastructure to ensure performance and capacity meet client requirements. Maintain effective communication to track progress and mitigate risks, implementing appropriate actions as necessary. Create and maintain technical documentation covering failure impacts and remediation. Own core routing and provide support for fiber infrastructure and transport technologies (e.g. Cisco DWDM, Cisco ASR Router, Cisco NCS). Technologies: Ansible Cisco Django IBM Support LAN MPLS Network Python Splunk VMware More: We are seeking a Core Network Engineer for an urgent contract role in Greater London, offering £500 per day (Inside IR35). In this position, you will play a critical role in managing high-end network connectivity and ensuring robust core infrastructure to support inter-regional and multi-site connectivity. You will work closely with senior stakeholders, demonstrating our commitment to effective collaboration and communication. We welcome diverse applicants and promote equal opportunities in our hiring process. Some occasional travel may be required, and candidates must be eligible to live and work in the specified location. If this opportunity aligns with your skills and career aspirations, we encourage you to apply as interviews will commence imminently. last updated 6 week of 2026