Abstract concrete curve of Toronto City Hall

PRACTICE 03 — SECURITY ARCHITECTURE

Designed for how your firm actually runs.

First-principles architecture for enterprise, cloud and critical infrastructure. If a control needs forty pages to explain, it's the wrong control.

THE PROBLEM

Most architectures are copied, not designed.

Vendor reference diagrams, the last consultant's template, whatever the incumbent already sold you — stitched together over a decade, until nobody can draw the whole estate on one page and every project fights security at the end instead of building on it from the start.

Good architecture is a small set of deliberate decisions that everything else can rely on. We draw those decisions, then stay to see them built.

A monochrome steel and concrete tunnel

If you can't draw it, you can't defend it.

WHAT WE DRAW

The one-page estate

Your systems, trust boundaries and real weak points on a single page — the drawing every incident, audit and project should start from.

Zero trust, sized to fit

Identity-first access and segmentation, sequenced so the business keeps running. No platform team required.

Cloud guardrails

Landing zones and identity models that make the secure path the easy one, so teams move faster rather than slower.

IT/OT boundaries

IEC 62443 zones and conduits, Purdue-model pragmatism — critical infrastructure drawn by people who've worked both sides of the fence.

Design authority

A standing architecture function for firms too small to staff one — reviewing designs, setting patterns, keeping projects honest.

STANDARDS WE WORK WITH
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IEC 62443 · PURDUE
NIST CSF · ISO 27001
DORA · NCSC CAF
ZERO TRUST

Frameworks come after the design, not before it.

We map every design to the standards your auditors and regulators expect — after it's been built for your firm. An architecture drawn from a compliance matrix defends the matrix; one drawn from how you actually operate defends the business.

And because what gets built is rarely exactly what was drawn, we stay through delivery as design authority, so exceptions are decisions rather than surprises.

WHERE WE'RE USUALLY CALLED IN

RELATED

Get the few big decisions right, and the rest of the estate falls into place.

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