Cyber Security Services for Government and Critical Infrastructure
We help organisations secure what matters most. From strategic guidance to deep technical delivery, Calexi embeds defence-grade cyber security into every layer of your operations.
Speak to our cyber security experts today and take the next step toward compliance, resilience, and assurance.
At Calexi, cyber security is more than protection, it’s about building trust, resilience, and operational confidence. Our secure-by-design approach integrates defence-grade controls across your IT and OT environments, ensuring your systems are not only protected but aligned with Australian government standards such as ISM, PSPF, and the Essential Eight.
We work with clients across Defence, national security, and critical infrastructure to design, build, and accredit high assurance ICT environments. From cyber maturity assessments and vulnerability scanning to strategic remediation roadmaps and executive advisory, we help you proactively manage risk and demonstrate compliance at every step.
Our experienced consultants combine technical depth with mission focus. Whether you’re designing a new network, recovering from legacy risks, or aligning cyber programs with business goals, Calexi brings clarity, precision, and outcomes that hold up in the real world.
Key Service Features
- Defence-grade secure architecture and implementation
- ISM, PSPF, and Essential Eight compliance consulting
- OT and critical infrastructure cyber protection
- Cyber maturity assessments and executive briefings
- Cyber threat detection and continuous monitoring
- Strategic cyber security advisory and governance
- Business and cyber program alignment
- Remediation planning and risk reduction
- Classified network design and accreditation
- Stakeholder engagement and reporting at all levels
Proven Capability in the Field
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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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Defence Cyber Training Environment
Calexi led the rapid redesign and remediation of a critical Defence cyber training environment, reducing risk levels, lifting Essential Eight compliance by more than 30%, and enabling the successful completion of a multinational exercise. Our secure-by-design approach delivered measurable, sustainable improvements under tight time and compliance pressures.
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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.
Why Calexi
Calexi is veteran-owned, values-driven, and mission-focused. Our consultants hold Australian security clearances and bring hands-on experience in cyber security, critical infrastructure, and high-assurance system delivery. We understand the regulatory landscape and operate with the discretion, structure, and clarity that Defence and government expect.
What sets us apart is our ability to combine strategic insight with technical delivery, helping you align cyber security with business outcomes, manage compliance risk, and build lasting operational resilience.