Delivering Hybrid Cloud Resilience for an ASX-listed Critical Infrastructure Provider
Sector: ASX-listed Critical Infrastructure Provider | Capability: Hybrid Cloud Transformation & Compliance Uplift | Timeframe: 2020
Problem
An ASX-listed critical infrastructure company was operating on an aging, poorly maintained ICT environment. The system was unable to scale to meet growth or international operations, was burdened with legacy technical debt, and could not achieve the high regulatory requirements for critical infrastructure. These risks were amplified by the COVID-19 pandemic, when the company was forced to move to full remote work.
Solution
Calexi staff led the end-to-end engineering, remediation, and rebuild of the environment. Key initiatives included:
- Delivering zero business outages throughout the transition.
- Adopting Microsoft 365 for secure collaboration and remote work.
- Implementing next-generation firewalls to strengthen perimeter and cloud security.
- Standing up a hybrid cloud environment to balance scalability and resilience.
- Migrating legacy systems progressively into the new environment without business disruption.
Results
The transformation delivered a major uplift in compliance, security, and business agility:
- Strengthened resilience so the company was able to weather COVID-19 without any staff layoffs.
- Achieved Essential Eight Maturity Level 1 across all areas in less than one month, with some domains reaching ML3.
- Enabled 100% remote work during COVID-19 with no business outages.
- Delivered secure global access for staff and partners.
- Provided the scalability to establish new development infrastructure and accelerate the speed of business operations.
Related Services
Cyber Security
Embedding secure-by-design principles across hybrid networks — including identity, access, and threat-detection hardening aligned with ISM and Essential Eight.
ICT Engineering
Designing, remediating, and modernising complex hybrid and cloud infrastructures to deliver scalable, resilient performance for enterprise and regulated environments.
Project Management
Overseeing enterprise transformation and remediation projects from planning to delivery, ensuring alignment with business, risk, and compliance objectives.
Proof Points
✓ E8 ML1 compliance achieved across all areas in under one month (ML3 in some domains)
✓ 100% remote work enabled with zero outages
✓ Secure global access established for staff and partners
✓ Company maintained operations through COVID-19 with no layoffs