Senior Network Architect

In this role you will lead assessment and design of enterprise network architecture within a secure defence environment, delivering current-state designs and practical roadmaps. You will work with the Defence programme's Architecture and Network teams to minimise risk and enable active/active connectivity across two data centres. Your work will include documenting designs, evaluating Cisco ACI, routing, firewall and load-balancing arrangements, and articulating implementation impacts. This opportunity lets you shape resilient, secure networks that support mission-critical services and influence future network strategy. You will operate in a collaborative, security-conscious setting with high

• Autonomy to develop and grow your skills and experience
• Exciting project work that makes a difference in society
• Strong, inspiring leadership
• Supportive and collaborative environment
• Development access to LinkedIn Learning
• Private Medical Insurance

• Review live network implementation and legacy design across both data centres to identify gaps
• Produce current-state High Level Designs and Low Level Designs with topology diagrams and dependencies
• Assess Cisco ACI, routing, firewall, and load-balancing arrangements with architecture and network teams
• Create a Network Review and Recommendation Report outlining practical, low-risk improvements
• Explore Cisco ACI application-centric capabilities including segmentation and policies
• Present a prioritised roadmap with sequencing, dependencies, and service impact
• Develop a Network Disaster Recovery Capability Report for true active/active connectivity
• Explain connectivity limitations, implementation approaches, risks, and required hardware/software/licensing
• Lead technical review discussions and secure sign-off of design documentation
• Maintain controlled documentation and contribute to risk/issue reporting through secure channels

• Strong enterprise network architecture experience with high/low-level design production
• Hands-on Cisco ACI experience (fabric, tenants, VRFs, bridge domains, endpoint groups, contracts)
• Strong Cisco routing knowledge, IP addressing, routing protocols, data centre connectivity
• Experience reviewing Cisco ASA firewall configurations, policies, NAT, high-availability
• Experience with F5 load balancers (traffic management, health monitoring, resilience)
• Experience assessing disaster recovery and active/active designs, failover and stateful dependencies
• Ability to investigate live configurations safely and propose proportionate changes
• Strong technical writing, diagramming and stakeholder communication; formal review experience

• strong written communication
• stakeholder engagement and collaboration
• ability to work independently on technical investigation
• Cisco ACI
• Cisco routing and IP addressing
• Cisco ASA firewall configurations