Secure IT Networking Solutions for Government and Industry
Calexi designs, deploys and maintains high-assurance networks. Built for performance, visibility and compliance.
Book a consult to improve network security, performance and resilience across your IT environment.
Your network is the backbone of your organisation. At Calexi, we design and deliver secure network solutions that enable performance and protect what matters most. Our team architects secure network topologies, defines VLAN structures, configures firewall policies, and implements encrypted tunnels across sites, cloud environments and operational technology networks.
We conduct in-depth network architecture reviews to identify risks and optimise flow. Our team supports firewall management, intrusion detection and prevention systems, and continuous monitoring to ensure your infrastructure is responsive, resilient and secure.
Ideal for high-assurance environments including Defence, national security, and regulated sectors, our networking services are tailored to align with compliance requirements such as the ISM and PSPF. Whether you’re building from scratch, scaling up, or reviewing security posture, Calexi provides reliable, secure networking solutions with assurance built in.
Key Service Features
- Secure network architecture design and reviews
- VLAN segmentation and policy definition
- Firewall rule management and tuning
- Intrusion detection and prevention systems (IDS/IPS)
- Encrypted VPN and inter-site tunnel deployment
- Hybrid cloud and on-prem network integration
- OT network security for critical infrastructure
- Network performance optimisation and tuning
- Continuous monitoring and capacity planning
- Compliance-aligned network documentation
Proven Capability in the Field
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Cyber Induction Course for Defence & Government
We designed and delivered a cyber induction course tailored for Defence and government staff, training over 300 participants across five departments. Our hands-on, practical approach bridged skill gaps, improved awareness, and built a consistent baseline of cyber security understanding across diverse audiences.
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Ransomware Incident Response
When a ransomware attack exposed poor practices and failed backups, Calexi led the recovery, restored three months of data, implemented emergency fixes, and re-architected the ICT environment. The organisation avoided major reputational and financial loss while strengthening long-term resilience.
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Cyber Security Tabletop Exercise for a Critical Infrastructure Water Operator
A transport critical infrastructure project was at risk due to cascading system failures caused by poor maintenance in a high-security environment. Calexi rapidly stabilised the systems in 2 weeks, reduced the risk profile from very high to medium, recommenced commissioning, and delivered a comprehensive maintenance plan with strong stakeholder confidence.
Why Calexi
Calexi is a trusted partner for Defence, government and regulated industry clients who require secure, reliable IT infrastructure. Our consultants bring hands-on experience across enterprise and OT networks, with a focus on compliance, performance and real-world resilience.
We operate with structure, discretion, and clarity. Ensuring networks are not only built right, but remain visible, auditable, and ready to support future needs. Whether you need design support, security reviews, or end-to-end management, Calexi delivers networking solutions you can depend on.