Top Network Engineer Jobs in Belfast

As a Junior Network Engineer, you will implement, maintain, and troubleshoot network and security aspects, working closely with a global team to support infrastructure.

Design, maintain, and optimize HLR/HSS/UDM subscriber templates and roaming logic. Lead Full MVNO profile deployments, collaborate with roaming partners and system integrators, define HLR/HSS KPIs, and troubleshoot signalling using Wireshark and roaming platforms.

Build and design proxy infrastructure from scratch, implement rotation systems, manage IP reputation, optimize for performance, and develop reverse proxy systems for various proxy types.

Implement, test, deploy, troubleshoot and maintain REST API and SIP telecom solutions. Monitor and tune infrastructure for high availability, develop test automation, perform packet/protocol analysis, support deployments and upgrades, participate in Tier 3 on-call rotation, and identify continuous improvement opportunities.

Responsible for designing, implementing and supporting networking solutions across multiple sites, maintaining firewalls, routing and security policies, troubleshooting outages and circuits, performing capacity planning and monitoring, ensuring compliance with public-sector security standards, participating in on-call rotation, and travelling to UK (and occasional international) sites.

Contract Data Centre Network Engineer to design, deploy, and operate high-performance data centre networks (leaf-spine, EVPN/VXLAN), manage routing (BGP/OSPF), automate configurations (Python/Ansible/Terraform), troubleshoot network and Linux systems, support Kubernetes networking, and contribute to monitoring, documentation, and capacity planning for AI/GPU infrastructure.

As a NOC Engineer, you will ensure network stability by monitoring, troubleshooting, and resolving incidents in a critical operational environment, while adhering to SLAs.

Design, configure, and maintain secure, scalable enterprise networks; administer Citrix NetScaler VPX; develop Ansible playbooks for automation; monitor and troubleshoot LAN/WAN/cloud networking, L4-L7 traffic, and routing (BGP/OSPF/VXLAN); document configurations and support infrastructure projects.

The Senior Network Engineer will support Exegy's network infrastructure, including administration, device maintenance, and collaboration with vendors for troubleshooting and changes.

Support commissioning, validation and transition of customer network services into BAU. Perform wireless and end-to-end network testing, onboard access points, switches and routers, produce handover documentation, and work with Project Managers, Commissioning Engineers, Provisioning and NOC to ensure operational readiness and quality standards.

Lead availability, reliability, and continuous improvement of the Connectivity platform. Use monitoring and telemetry to detect and resolve service issues, drive automation and process optimisation, collaborate across teams and partners, contribute to platform strategy and roadmaps, and support major incident resolution.

Lead design, implementation, and support of datacentre and enterprise network and perimeter security systems. Own low-level designs, project rollout, documentation, supplier coordination, and handover to operations. Provide 24/7 support, troubleshooting, incident/change management, and continual improvement for managed service health customers.

The Senior Network Automation Engineer will enhance Perl code for network automation, maintain REST APIs, reduce technical debt, and support junior engineers.

Lead deployment and maintenance of UK Government network infrastructure (primarily Cisco), enhance security posture with SD-WAN, NGFWs, segmentation and content delivery, manage lifecycle and inventories, mentor engineers, drive project execution, and produce compliance and KPI reporting for senior leadership.

Lead technical delivery of customer projects and act as technical lead on network faults and major incidents. Provide hands-on, customer-facing support for enterprise SD‑WAN, LAN/WLAN, and security solutions; troubleshoot high-pressure incidents, manage escalations and change requests, and maintain technical documentation. Requires UK site travel and occasional out-of-hours work.

Lead availability, reliability and continuous improvement of the Connectivity platform. Monitor, diagnose and resolve service issues using telemetry and data. Build partner relationships, drive automation and process optimisation, contribute to roadmap and incident response, and support service transitions to meet business objectives.