Secure ICT 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 ICT 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 Tabletop Exercises
Defence required cyber exercises that reflected its unique environment and policies. Calexi delivered dynamic cyber tabletop exercises that improved response plans, created new playbooks, and uplifted staff readiness. The program trained 15 incident managers and received exceptional feedback for its realism — with lessons equally applicable to critical infrastructure operators.
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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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SME Essential Eight Compliance
A Defence industry SME required Essential Eight compliance to execute a Defence contract. Calexi delivered a full uplift in just four weeks, achieving ML1 across all areas, ML3 in key controls, and DISP membership within 3 months — reducing risk from very high to low/medium.
Why Calexi
Calexi is a trusted partner for Defence, government and regulated industry clients who require secure, reliable ICT 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.