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About the Role

We are seeking an IT Infrastructure Engineer (Network) to contribute to the engineering, implementation, support, and optimisation of enterprise network services, supporting office, data centre, and hybrid cloud networking environments. This is a hands-on engineering role focused on delivering resilient, secure-by-design, and high-performance network platforms using predominantly Cisco technologies, with exposure to Juniper and cloud-native networking. The role will be critical in ensuring network segmentation, security, and scalability across the organisation’s global infrastructure. The role requires solid technical capability, strong troubleshooting skills, and effective collaboration across teams.

Responsibilities

Engineer and support network infrastructure, including office/campus networks, data centre networking, and hybrid cloud connectivity (Azure, GCP).
Implement, support, and input to the design of secure, scalable network solutions across LAN/WAN/Data Centre/Cloud.
Support and optimise Cisco-based network platforms, including routing and switching, Cisco ACI, and policy-driven segmentation.
Support and manage F5 load balancing platforms, including LTM configuration and optimisation, traffic management, application delivery, and high availability/failover design.
Deliver secure-by-design network architecture, including network segmentation, micro-segmentation, Zero Trust principles, and alignment to enterprise security controls.
Implement, support, and input to the design of hybrid networking solutions, including connectivity to Azure and GCP, and VPN/private connectivity models.
Troubleshoot and resolve complex network incidents and performance issues across multi-layer environments.
Contribute to network automation and standardisation to improve operational efficiency.
Produce and maintain high-quality network documentation, including high-level and low-level designs, network diagrams, runbooks, operational procedures, and configuration standards.
Collaborate with security, cloud engineering, and platform/infrastructure teams.
Participate in the on-call rota to support critical network incidents.

Requirements

Good hands-on experience with Cisco networking technologies.
Good hands-on experience with data centre networking and Cisco ACI.
Good hands-on experience with F5 load balancing platforms.
Experience with Juniper networking technologies (desirable).
Experience with hybrid cloud networking (Azure and/or GCP).
Strong knowledge of network segmentation and secure network design.
Strong knowledge of routing and switching protocols (e.g. BGP, OSPF).
Strong knowledge of Layer 4–7 load balancing concepts.
Strong knowledge of high availability and resilient design.
Proven ability to implement, support, and contribute to the support of enterprise-scale network environments.
Good troubleshooting experience across LAN, WAN, data centre fabric, and hybrid cloud connectivity.
Ability to implement complex technical delivery and provide strong contributions to problem resolution.
Strong understanding of secure-by-design networking.
Strong understanding of network segmentation strategies (macro and micro segmentation).
Strong understanding of high availability, resilience, and fault tolerance.
Hands-on experience implementing and operating Cisco ACI environments.
Ability to contribute to design decisions in partnership with architecture teams.

Skills

Cisco networking technologies
Data centre networking
Cisco ACI
F5 load balancing platforms
Juniper networking technologies
Hybrid cloud networking (Azure, GCP)
Network segmentation
Secure network design
Routing and switching protocols (BGP, OSPF)
Layer 4–7 load balancing concepts
High availability
Resilient design
Troubleshooting
Network automation
Standardisation
Network documentation
Collaboration
Network automation tools (Ansible, Terraform)
Container networking
Modern application delivery

Location

Global

Work Type

Flexible working hours
Option to work from home

Experience Level

3-5 years of experience in enterprise networking

Education Level

Degree in Computer Science, Networking, or related field (or equivalent experience)

Benefits

Flexible working hours
Option to work from home
Extensive induction program with experienced mentors and buddies
Opportunities for further development and educational opportunities
Global Family Leave Policy
Employee Assistance Program
Internal inclusion & diversity employee networks

About the Company

Colt provides network, voice and data centre services to thousands of businesses around the world, allowing them to focus on delivering their business goals instead of the underlying infrastructure.
At Colt, you’ll make a difference. Because around here, we empower people. We don’t tell you what to do. Instead, we employ people we trust, who come together across the globe to create intelligent solutions. Our global teams are full of ambitious, driven people, all working together towards one shared purpose: to put the power of the digital universe in the hands of our customers wherever, whenever and however they want. We give our people the opportunity to inspire and lead teams, and work on projects that connect people, cities, businesses, and ideas. We want you to help us change the world, for the better.

Equal Opportunity

Inclusion and valuing diversity of thought and experience are at the heart of our culture here at Colt. From day one, you’ll be encouraged to be yourself because we believe that’s what helps our people to thrive. We welcome people with diverse backgrounds and experiences, regardless of their gender identity or expression, sexual orientation, race, religion, disability, neurodiversity, age, marital status, pregnancy status, or place of birth.
Signed the UN Women Empowerment Principles which guide our Gender Action Plan
Trained 60 (and growing) Colties to be Mental Health First Aiders
Please speak with a member of our recruitment team if you require adjustments to our recruitment process to support you. For more information about our Inclusion and Diversity agenda, visit our DEI pages.