ICT Engineering Services for Government and Defence
We design, integrate and deliver secure ICT systems that work in the real world — from blueprint to handover.
Partner with Calexi for high-assurance ICT engineering that stands up to scrutiny and scales with confidence.
At Calexi, our ICT 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 ICT 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
Classified ICT Environment Delivery for Defence
Calexi staff led the engineering and accreditation of a classified ICT environment within the Department of Defence. This included requirements analysis, detailed architecture, secure system build, and operational support. Our consultants delivered all design and implementation artefacts, coordinated across vendors and departments, and ensured system certification under Defence standards. Their success in navigating security, compliance, and delivery pressure demonstrates the calibre of engineering capability available at Calexi.
OT System Integration for a Major National Project
Ahead of the Brisbane Olympics, Calexi staff contributed to a landmark operational technology deployment requiring world-first integration. Our engineers were brought in to solve complex configuration and interoperability challenges, delivering quality outcomes under tight timelines. Their work helped stabilise delivery, accelerate readiness, and reinforce client confidence in a demanding environment. These results reflect Calexi’s hands-on experience in high-assurance ICT system engineering.
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 ICT 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.