OT SECURITY & ARCHITECTURE /

Strengthen protection and visibility across your OT environment without compromising performance.

From secure network architecture to continuous monitoring and incident response, Tier16 designs and hardens industrial control environments so operators can modernise with confidence, not risk.

Operational technology wasn’t built for today’s threat landscape and bolting security on after the fact rarely holds up under audit or attack. Our Security & Architecture services embed protection into the foundation of your OT environment: from how systems are designed and segmented, to who can access them, to how quickly you detect and respond when something goes wrong. This pillar underpins SOCI Act compliance and gives critical infrastructure operators a defensible security posture across every layer of the OT stack, including:

1. OT Architecture & Technology Selection
We design secure-by-default OT architectures — from network segmentation and zoning to selecting the right platforms and vendors for your environment. Every architectural decision is made with resilience, compliance, and long-term maintainability in mind, not just short-term functionality.

2. Network & Computing Infrastructure
Secure, resilient infrastructure underpins everything else. We assess and harden the networking and computing layers your OT systems run on — reducing attack surface while maintaining the availability critical infrastructure demands.

3. Access & Identity Management
Uncontrolled access is one of the most common OT vulnerabilities. We implement role-based access control, least-privilege principles, and identity management practices tailored to industrial environments — so the right people have the right access, and nothing more.

4. Security Logging & Monitoring
Visibility is the foundation of response. We design and implement logging and monitoring capability across OT assets and networks, giving your team continuous insight into what’s happening in your environment — and the audit trail regulators expect.

5. Vulnerability & Third-Party Security
Every connected device, vendor, and integration is a potential entry point. We identify, assess, and manage vulnerabilities across your OT estate and third-party relationships, reducing risk before it becomes an incident.

6. Incident Response
When something does go wrong, response speed and clarity matter. We help operators build and rehearse OT-specific incident response plans — so your team knows exactly what to do, minimising downtime and damage when it counts.

OT SOFTWARE asset VISIBILITY/

Effective OT Security starts with accurate identification and classification of critical assets. Our OT asset management services provide visibility across operational technology environments through structured asset discovery, classification, and lifecycle management.

By maintaining an accurate OT asset inventory and understanding system dependencies, organisations can reduce unknown risks, improve security decisions, and support SOCI Act compliance and CIRMP-aligned risk management programs.

OT SECURITY FAQ/

What's the difference between OT security and IT security?

IT security is built around protecting data – confidentiality is usually the top priority. OT security is built around protecting physical processes, where availability and safety come first. A control system can’t simply be patched and rebooted mid-shift the way an office laptop can, so OT security has to account for legacy equipment, uptime requirements, and the physical consequences of a system failure. We design security around these OT-specific constraints, not generic IT frameworks.

Do we need to replace our existing infrastructure to improve OT security?

Not necessarily. Most environments can be meaningfully hardened through network segmentation, access controls, and monitoring layered around existing infrastructure, rather than wholesale replacement. Our role is to assess what you have first and recommend the minimum disruptive path to a stronger security posture — full modernisation is only proposed where it’s genuinely the right call, not the default answer.

What happens if a vulnerability is found in a third-party vendor's system?

We assess third-party and vendor risk as part of the same process – since a single unmanaged connection or outdated vendor component can undermine an otherwise secure environment. Where a vulnerability is identified, we help you assess the actual operational risk it poses and prioritise remediation accordingly, rather than treating every finding as equally urgent.

How quickly can incident response capability be put in place?

Timelines depend on the current state of your environment, but most operators can have a foundational OT-specific incident response plan in place within a few weeks covering roles, escalation paths, and initial containment steps. From there, we typically recommend a tabletop exercise to test and refine the plan before treating it as audit-ready.

How does this pillar support SOCI Act compliance?

Security & Architecture directly addresses several SOCI Act obligations under the Critical Infrastructure Risk Management Program (CIRMP) — particularly around cyber and information security hazards. Secure architecture design, access management, logging, and incident response all feed into the evidence and controls regulators expect to see during an audit.

securing critical infrastructure /

We deliver end-to-end OT security services designed to protect industrial environments and ensure SOCI compliance in practice.