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IT Audit · CISA-Led · Big-4 Methodology

Senior-led audit depth.
Big-4 rigour, without the overhead.

Every engagement is led by a CISA, CISM, and ISO 27001 Lead Auditor with Big-4 audit experience. You get structured methodology, senior involvement throughout, and findings you can actually use — without the overhead, the delegation, or the invoice to match.

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Our IT Audit Services

Assess, report, remediate — with precision

A comprehensive controls review, a compliance snapshot, or targeted assurance over a specific risk area — whatever the scope, you get findings you can act on. Not just a PDF that gathers dust.

IT Controls Audit

Your IT general controls — access management, change management, operations, and data backup — tested for both design and operating effectiveness. The same structured methodology used in Big-4 external audits, applied directly to your environment. Findings ranked by materiality, not padded for billable hours.

IS Audit & Compliance Review

Your policies, procedures, and technical controls assessed against the standards that matter to you — ISO 27001, NIST, or your sector's regulatory framework. You get a clear compliance posture and a prioritised remediation roadmap, built to hold up when auditors and regulators come calling.

Third-Party & Vendor Audit

Your supply chain is only as secure as your least-scrutinised vendor. We assess critical third parties against your contractual requirements, data protection obligations, and applicable frameworks — NIS2 supply chain provisions and ISO 27001 Annex A controls included. The evidence base you need to challenge vendors and satisfy regulators.

Credentials & Experience
CISA & CISM Certified
ISACA's two most rigorous professional credentials — held by the lead auditor on every engagement, not delegated to junior staff once the contract is signed.
ISO 27001 Lead Auditor
The same assessment lens used by ISO certification bodies — applied as an independent consultant, with no commercial pressure to issue certificates or extend engagements.
Big-4 Audit Background
Grounded in hands-on Big-4 audit experience. The same structured methodology and professional standards — applied directly to your organisation, without the overhead, the generalist teams, or the junior-led fieldwork.
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Find out what your controls actually look like — before someone else does.

Most organisations discover their control gaps during a breach, a regulatory review, or a failed vendor audit. Bitsecura brings Big-4 rigour to your organisation before the pressure arrives — senior-led, structured, and built to give you answers you can act on.

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How We Work

From scoping to sign-off

Every engagement follows the same disciplined four-phase process. No surprises, no scope creep — just a clear methodology and findings you can act on from day one.

Step 01

Scoping

We define the audit universe, objectives, and criteria upfront — what systems, processes, and controls are in scope, what standards we're auditing against, and what a successful outcome looks like. Clear scope prevents wasted effort and ensures findings are relevant to your actual risk landscape.

Step 02

Fieldwork

Structured interviews with control owners, evidence review, and technical testing to validate whether controls are designed appropriately and operating effectively. We test what matters — not just what's easy to document.

Step 03

Reporting

Findings are documented with risk ratings, root cause analysis, and actionable recommendations — written for both technical teams and executive stakeholders. Every finding tells you what it is, why it matters, and what to do about it.

Step 04

Management Response

We work with your team to develop realistic remediation plans with agreed timelines — and can support follow-up reviews to validate that recommendations have been implemented effectively. The audit doesn't end at the report.

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