Consulting
End-to-end design and implementation of management systems and compliance programmes, from gap analysis to certification readiness.
London · Istanbul · Baku
Governance, Risk & Compliance, without compromise.
C4Sec is an international advisory firm helping organisations meet the world's most demanding security, resilience and data-protection standards — through one connected partnership across the UK, Türkiye and Azerbaijan.
Frameworks we deliver
ISO/IEC 27001ISO 22301GDPR · KVKKDORASOC 2PCI DSSCyber Resilience Act
Who we are
A global partnership, built for the security era
Founded in London and operating through managing partners and country representations, C4Sec brings the structure and rigour of a global professional-services firm to governance, risk and compliance.
We combine deep regulatory knowledge with hands-on engineering experience. Our consultants are practising auditors — so the management systems we design are not theoretical templates, but living frameworks your teams can run, evidence and improve.
More about the firm“One firm.
Many borders.
One standard.”
Many borders.
One standard.”
- One firm, many bordersConsistent methodology and quality across every country we operate in.
- Auditor's mindsetAdvice shaped by people who certify, not just consult.
- Tailored, never templatedSolutions designed around your organisation, sector and risk appetite.
- Outcome accountabilityWe measure success by your compliance, resilience and confidence.
What we do
Three disciplines, one standard of excellence
Advisory, training and independent audit — delivered across information security, business continuity, data protection and emerging regulation.
Training
Accredited and bespoke training that builds lasting capability in your teams — governance, privacy, resilience and security awareness.
Audit & Assurance
Independent internal audits, supplier assessments and gap analyses that give your board evidence-based assurance.
Standards & regulation
Fluent in the frameworks that matter
From established management-system standards to the latest EU regulation, we help you interpret requirements and turn them into operating reality.
Information Security
ISO/IEC 27001 management systems and security governance.
Business Continuity
ISO 22301 resilience and recovery programmes.
Data Protection
GDPR, UK GDPR and KVKK privacy compliance.
DORA
Digital Operational Resilience Act for financial entities.
SOC 2
Trust Services Criteria readiness and attestation support.
Cyber Resilience Act
Product security obligations for digital products in the EU.
How we work
A disciplined path from assessment to assurance
Assess
Gap analysis and risk assessment to understand where you stand against the standard.
Implement
Documentation, controls and processes designed around your business objectives.
Comply
Internal audit and readiness review to prepare you for independent certification.
Improve
Continuous monitoring and enhancement so the system evolves with your risk.
By the numbers
Trusted to deliver, accountable for outcomes
35+Engagements completed
99%Client satisfaction
6Operating countries
20+Experts & partners
Global presence
Local partners, global standards
We are building C4Sec as a network of managing partners and country representations — beginning with the United Kingdom, Türkiye and Azerbaijan.
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United KingdomLondon
Our UK practice aligns international frameworks with the FCA and PRA operational-resilience rules, UK GDPR under the ICO, and NCSC guidance.
TürkiyeIstanbul
By combining our international frameworks with EPDK, BDDK, KVKK, TCMB and SPK requirements, we build a single compliance programme for organisations operating in Türkiye.
AzerbaijanBaku
Our Azerbaijan practice aligns international frameworks with the requirements of the Central Bank (CBAR) and financial-market supervision.
United Arab EmiratesDubai
Our Dubai practice aligns international frameworks with UAE regulators — the Central Bank, DFSA, and national information-assurance standards.
GermanyFrankfurt
Our Germany practice combines international frameworks with BSI IT-Grundschutz, DORA, NIS2 and TISAX.
IrelandDublin
Our Ireland practice aligns international frameworks with the Central Bank of Ireland, DORA, NIS2 and GDPR under the Irish DPC.
Ready to raise your compliance standard?
Speak with one of our managing partners about your security, resilience or data-protection objectives.