Services
At Calexi, we partner with government, defence and critical‑infrastructure clients to deliver secure, people‑centric ICT and cybersecurity solutions. Whether you need end‑to‑end programme delivery or a rapid remediation response, our cleared experts combine deep regulatory know‑how with tailored methodologies to achieve real results.
Cyber Security
We design and implement secure‑by‑design architectures that embed defence‑grade controls into every layer of your IT estate. From comprehensive vulnerability assessments and code reviews to full red‑team exercises and continuous monitoring, defensive operations, we proactively identify and neutralise threats. Our tailored remediation roadmaps help you manage risk and demonstrate compliance with ISM, PSPF and Essential Eight.
ICT Engineering
Our end‑to‑end engineering capability covers requirements capture, solution architecture, build‑outs and system handover. We specialise in high‑assurance environments—integrating complex multi‑vendor systems, conducting rigorous testing and validation, and delivering fully documented designs. Whether you’re standing up new platforms or modernising legacy estates, we ensure seamless interoperability and robust security.
Governance, Risk & Compliance
Navigate PSPF, ISM, NIST and ISO 27001 frameworks with confidence. We perform detailed gap analyses and risk assessments, develop policies and procedures, and provide audit‑readiness support. Our pragmatic approach translates complex mandates into clear, actionable roadmaps—helping you achieve and maintain certification, reduce audit friction and drive continuous improvement.
ICT Systems Administration (MSP)
Enjoy peace of mind with fully managed Windows, Linux, cloud and on‑prem infrastructure. Our support includes patch management, backup and restore services, performance tuning and incident response. We document all configurations and maintain runbooks, ensuring repeatable, auditable operations that align with your security and availability requirements.
ICT Networking Solutions
We architect and deploy secure network topologies—designing VLAN segmentation, firewall policies and encrypted tunnels to protect data flow across sites and cloud environments. Our optimisation services improve throughput and resilience, while ongoing monitoring and capacity planning keep your network primed for growth and change. Ideal for both enterprise and OT networks.
Systems Engineering & Integration
Using Model‑Based Systems Engineering (MBSE) principles, we map stakeholder needs to technical requirements, design detailed interface control documents and orchestrate multi‑vendor integration. Our CI/CD pipelines automate build and deployment, while structured test labs validate interoperability before go‑live. The result: a cohesive, resilient system delivered on schedule and budget.
High‑Risk Project Management
When projects stall or risks spike, our rapid‑response team steps in to realign stakeholders, clarify scope and rebuild momentum. We conduct root‑cause workshops, replan deliverables with clear milestones, and apply rigorous governance to track progress. In weeks rather than months, we restore confidence and set the programme back on course.
Technology Development & Innovation
From proof‑of‑concepts to custom toolchains and automation scripts, we accelerate capability delivery with lean R&D sprints. Whether you need hardware, software, bespoke dashboards, AI‑driven analytics or integration with emerging platforms, our developers and architects collaborate closely with your teams to deliver working prototypes that evolve into production‑ready solutions.
Operational Technology (OT) Security
Protect your industrial control systems with specialised segmentation, protocol filtering and end‑to‑end encryption. We onboard OT assets into SIEM platforms, configure secure remote access gateways and conduct periodic integrity checks. Our continuous assurance model ensures that updates and changes never compromise safety, compliance or uptime.
Cloud & DevOps
We architect, deploy and optimise cloud‑native environments across AWS, Azure and private platforms—implementing Infrastructure as Code, CI/CD pipelines and container orchestration for faster, more reliable releases. Our end‑to‑end DevOps practice includes automation of build, test and deployment processes, cost‑optimisation reviews and monitoring to keep your cloud services resilient and scalable.