IT Engineering Services for Government and Defence
We design, integrate and deliver secure IT systems that work in the real world — from blueprint to handover.
Partner with Calexi for high-assurance IT engineering that stands up to scrutiny and scales with confidence.
At Calexi, our IT engineering services span the entire solution lifecycle. From requirements capture and architectural design through to delivery, testing and secure handover. We specialise in high-assurance environments, supporting Defence, government, and critical infrastructure clients with trusted engineering capability.
Our engineers work across complex, multi-vendor landscapes to deliver secure, interoperable systems that meet operational, regulatory, and mission needs. Whether you are building a new platform or modernising a legacy environment, we ensure every component is architected for security, performance, and compliance.
From hands-on build and integration through to system validation, documentation, and stakeholder engagement, Calexi brings precision, structure, and momentum to critical IT programs.
Key Service Features
- Requirements capture and stakeholder alignment
- Solution architecture and secure system design
- Multi-vendor integration and interoperability
- High-assurance platform build and deployment
- Rigorous test planning and validation
- System hardening and ISM alignment
- Full documentation and operational handover
- Legacy system transformation and uplift
- Engineering support for accreditation processes
- Ongoing lifecycle and sustainment planning
Proven Capability in the Field
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Microsoft 365 Service Migration
A Defence SME struggling with multi-day outages migrated to Microsoft 365 under Calexi’s leadership. The seamless migration achieved zero downtime, 100% staff adoption, and significant resilience uplift, enabling faster collaboration and growth.
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ASX Hybrid Cloud
An ASX-listed critical infrastructure company faced major risks from an aging, non-compliant ICT environment. Calexi staff delivered a hybrid cloud transformation during COVID-19, enabling 100% remote work, achieving E8 compliance in under a month, and ensuring no staff layoffs while strengthening security and scalability.
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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.
Why Calexi
Calexi is an Australian-owned consultancy with security-cleared engineers and a track record of success in Defence and regulated sectors. We understand the demands of delivering critical IT systems in high-assurance environments, where compliance, clarity, and confidence matter.
Our consultants combine deep technical expertise with structured delivery, from requirements workshops to signed-off solutions. We know how to move from intent to implementation without compromising security, compliance, or business continuity. Whether you’re building from the ground up or recovering a project at risk, Calexi brings the engineering discipline needed to succeed.