Senior Network Engineer

OpticoreIT; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Opticore IT in London is seeking a Senior Network Engineer to design and deliver Cisco ACI-based solutions across multiple UK data centre fabrics. The role involves hands-on design, integration, and governance to stabilise and scale the ACI estate.

You will work with a large telecommunications client, with 2 days on site, focusing on L3 networking, BGP/OSPF, MPLS, and RAN gateway integration, with opportunities for expansion in future phases.

Qualifications

• Hands-on design experience with Cisco ACI in multi-fabric environments.
• Strong Layer 3 networking knowledge with BGP/OSPF.
• Experience integrating ACI with RAN gateways and MPLS networks.
• Experience planning across multiple data centre fabrics.

Responsibilities

• Deployments are done using an automation tool sending the configuration into ACI.
• UK-based fabrics, moving to 5–6 in the future.
• Create LLDs from the existing HLD being followed.
• Layer 3 network connections to RAN gateways and MPLS networks.
• Deliver and drive progress, becoming the ACI guru for the client.

Skills

Cisco ACI

Multi-fabric

Layer 3

BGP

OSPF

MPLS

RAN gateways

Data center fabrics

Job description

Opticore IT is a specialist Network Engineer and Project Management consultancy offering a wide variety of opportunities to work within fast-paced, challenging environments across our client base spanning multiple sectors including Finance, Broadcast Media, Telecommunications and more.

Opticore IT are currently searching for a Senior Network Engineer with strong hands on design experience with Cisco ACI, including multi fabric environments.

This is a permanent position which will require 2 days per week on site in London.

The role will involve working with a large telecommunications client of ours who are redesigning their ACI setup.

This engagement focuses on stabilising, leading, and scaling the Cisco ACI estate across three UK-based data centre fabrics, with planned expansion to five or six fabrics in future phases. The core objective is to take ownership of ACI design and delivery, improve current execution performance, and establish a structured, scalable approach to deployment and governance.

What you'll be doing

• Deployments are done using and automation tool sending the configuration into ACI.
• All 3 fabrics are UK based, moving to 5 or 6 in the future.
• You will be creating the LLDs from the already created HLD being followed.
• Layer 3 network - connecting to RAN gateways, also MPLS Networks
• Deliver and drive things forward & become the ACI guru for them. If this goes well, there is a lot more work future work required and planned.

What you'll bring

• Hands-on design experience with Cisco ACI, including multi-fabric environments.
• Strong knowledge of Layer 3 networking, routing protocols (BGP, OSPF), and enterprise connectivity principles.
• Experience integrating ACI with RAN gateways and MPLS networks.
• Experience working across multiple data centre fabrics and planning for scale/expansion.

Diversity

At Opticore IT we embrace diversity and are committed to equal opportunities. We actively recruit for an inclusive and diverse workforce and as such, want to ensure we do everything we can to support your application.

We want you to feel empowered to let us know if you require any adjustments to be made with your application or interview process so please speak to our recruitment team.