Penetration testing · UK, EU & US

Find the gaps before an attacker does.

Experienced testers probe your applications, APIs, cloud and network the way a real adversary would. You get a clear report, a fix plan and a retest to prove it worked.

Book a scoping call See what you receive

20+ years of testing experience
OWASP & PTES methodology
SOC 2 & ISO 27001 ready evidence

Map your attack surface

Select what you want tested

2 in scope

Suggested engagement

Comprehensive test

Scope this with us

What we test

Every layer an attacker could reach.

Manual testing led by experienced specialists, backed by tooling. Each engagement is scoped to your stack and your compliance goals.

Web application testing

Authentication, session handling, access control, injection and business-logic flaws. Mapped to the OWASP Top 10 and ASVS.

API testing

REST and GraphQL endpoints tested against the OWASP API Top 10.

Cloud security

AWS, Azure and GCP configuration, IAM and exposed services.

External infrastructure

Internet-facing hosts, services and perimeter defences.

Internal network

Lateral movement, privilege escalation and Active Directory.

Retesting

We verify every fix and reissue your report with closed findings.

Continuous scanning

Scheduled vulnerability scans between tests, triaged by a human.

Specialism

Amazon SP-API security assessment

Testing built around Amazon’s Data Protection Policy. We assess how your integration stores, encrypts and exposes seller and buyer PII, then give you evidence for your developer profile review.

PII handlingToken storageEncryption at restAccess logging

Explore the SP-API assessment

How an engagement runs

Four steps. No surprises.

01
Scope
A call to agree targets, test windows and rules of engagement. You get a fixed quote.
02
Test
Hands-on testing with daily check-ins. Critical issues are flagged the same day.
03
Report
An executive summary for the board and reproducible findings for your engineers.
04
Retest
We confirm your fixes and issue an updated report you can share with auditors.

09:02SCOPEapp.client.io, api.client.io confirmed

09:14RECON37 endpoints mapped from OpenAPI spec

10:41MEDIUMVerbose errors expose stack traces

11:26HIGHJWT accepted after password reset

13:08CRITICALBOLA on /orders/{id} — client notified

15:30FIXEDNV-001 patched, retest scheduled

Confidential

Penetration test report

Executive summary

Critical

High

Medium

Low

NV-001 · CVSS 9.1

Broken object-level authorisation on /orders

Critical

What you receive

A report your board and your engineers can both use.

Every finding is rated, reproducible and paired with a fix. The format is built to drop straight into SOC 2, ISO 27001 and Amazon SP-API evidence packs.

Plain-English executive summary and risk rating
CVSS-scored findings with proof of concept
Prioritised remediation plan
Attestation letter for customers and auditors

Who we work with

Built for teams that need proof, not just a scan.

CTOs and engineering leads
Findings your team can reproduce and fix in the next sprint.
Amazon sellers and SP-API developers
Evidence aligned with Amazon’s data protection requirements.
SaaS teams pursuing SOC 2 or ISO 27001
An independent test your auditor will accept.
Regulated SMEs in finance and health
Testing that stands up to regulators and enterprise buyers.
Owners and boards planning what’s next
Strategy, delivery and go-to-market advice from senior consultants.

Beyond testing