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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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.
![A military officer in camouflage uniform stands before a futuristic holographic interface. The display shows a glowing radar, world map, graphs, and charts, with a central glowing arrow pointing upward labeled “Strategic Alignment.” The scene symbolizes clarity, visibility, and aligning Defence cyber capabilities with strategic objectives.]()
Defence Capability Review
Calexi completed a Defence cyber capability review in just six weeks, engaging hundreds of stakeholders to provide clear visibility of the current state, align future technologies with strategy, and deliver actionable, risk-based recommendations with strong buy-in.
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Building a Sovereign Cyber Training Capability for Defence
Defence faced mounting challenges in building a skilled cyber workforce, from costly overseas training to critical skills gaps. Calexi staff designed and delivered a sovereign training program that equipped over 300 personnel, including 30+ incident responders, while saving more than $2M and creating a sustainable pipeline of skilled SOC operators.
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.