Are you searching for a professional penetration testing company in the UK? Want a provider who goes beyond the typical pentesting services and actually partners with you on your security journey? Welcome to EJN Labs, a London-based leader in penetration testing services and cyber security consulting, engineered to help organisations uncover risks, build resilience, and meet compliance faster.
In an industry crowded with penetration testing companies UK wide, EJN Labs stands out with rapid delivery, advanced methodologies, and client-friendly terms that are unmatched. In this article, you will discover what EJN Labs does, how our penetration testing services compare to those of other pen testing companies UK businesses use, and why our unique approach sets new benchmarks in security testing services.
Who Are EJN Labs?
EJN Labs is a cutting-edge penetration testing company based in Canary Wharf, London. Our core focus is helping businesses of all sizes, start-ups to enterprises, achieve practical, effective cyber security through world-class penetration testing services, continual support, and future-fit security advice.
Whether your company needs a regulatory penetration test for compliance (ISO 27001, SOC 2, PCI-DSS, Cyber Essentials Plus), proactive risk assessment, or bespoke attack simulation, EJN Labs’ testers bring extensive hands-on skills. Many are CREST and CHECK certified, ensuring the depth and rigour regulators and boards demand.
Our Penetration Testing Services
As one of the top pen testing companies UK businesses trust, EJN Labs offers a complete suite of application, cloud, network, and specialist pentesting services. This breadth means you can secure every layer of your environment from one trusted provider.
1. Web Application Penetration Testing
Our web application testing follows the OWASP Top 10 and industry best practices to identify injection flaws, authentication bugs, authorisation gaps, logic errors, and data exposure risks in your business-critical web platforms.
2. API Penetration Testing
Modern SaaS companies rely on APIs to power functionality. EJN Labs’ API penetration testing services uncover complex direct and indirect vulnerabilities in REST, GraphQL, SOAP, and other API architectures.
3. Mobile Application Penetration Testing
We offer deep-dive pen testing on Android and iOS apps, focusing on data storage, insecure communications, authentication bypass risks, reverse engineering threats, and business logic weaknesses.
4. External Infrastructure Penetration Testing
Let us uncover perimeter risks in your external network, including firewalls, VPNs, remote access portals, email security, and cloud-exposed assets. Our penetrations simulate a real UK-based attacker, giving you clear insights before criminals do.
5. Internal Infrastructure & Active Directory Penetration Testing
Security breaches often start from the inside. We emulate insider threats to test network segmentation, privilege escalation paths, and weaknesses in Active Directory, a critical focus for UK enterprise security teams.
6. AI & LLM Security Penetration Testing
AI products and Large Language Model-powered platforms are at the frontier of emerging threats. EJN Labs leads with specialist AI penetration testing, adhering to OWASP LLM guidelines.
7. Cloud Security Penetration Testing
EJN Labs is unique among penetration testing companies London and UK-wide for our breadth in cloud assessments:
- Amazon Web Services (AWS) security reviews
- Microsoft Azure penetration testing
- Google Cloud Platform (GCP) security reviews
We evaluate misconfigurations, IAM roles, exposed services, serverless functions, and integrated APIs.
8. Thick Client Application Testing
If your business runs desktop or legacy applications, our experts perform thick client penetration testing to uncover binary vulnerabilities, insecure protocols, and privilege escalation vectors.
9. Phishing Assessments
Human error bypasses the best technical controls. EJN Labs runs simulated phishing campaigns, tailored to your business, and helps you create a culture of phishing resilience.
10. Code Reviews
We offer secure code reviews by industry experts for critical systems, APIs, or apps—finding security bugs before attackers can.
11. Bug Bounty Management
Harness the power of the security research community with our managed bug bounty programmes. We vet and triage external findings quickly, guiding you through remediation and reporting.
12. Purple Teaming & Threat Intelligence
Purple Teaming combines the offensive expertise of red teams with defensive security teams (blue teams) to maximise detection and response readiness. Our ongoing threat intelligence keeps your controls tuned against the latest attacks.
What Makes EJN Labs Different From Other Penetration Testing Companies?
Why do so many businesses trust EJN Labs over traditional pen testing companies in the UK? Here are the core reasons:
1. Unlimited Free Retesting
Fixing issues is just as important as finding them. Unlike most penetration testing companies, EJN Labs offers unlimited free retests for any vulnerabilities identified. Once you have applied our remediation advice, simply ask for retesting, without extra charges.
2. Ongoing Expert Support
A lot of pen testing providers drop a lengthy report and leave you to figure out the rest. At EJN Labs, your dedicated security consultants remain available post-engagement. We offer debrief sessions, email/phone support, and guidance on remediation, making us far more than a “tick-box” service.
3. Free Unlimited Rescheduling
Need to change your test date due to unforeseen tech or staffing issues? EJN Labs never charges for changing your schedule, even if it happens multiple times. We put service ahead of profit, giving you peace of mind.
4. No Extra Charge for Out-of-Hours Work
Some penetration testing services surprise clients with “overtime” fees for evening or weekend test work. At EJN Labs, out-of-hours testing is included in our clear daily rate, perfect for businesses that prefer to test outside core working hours to minimise disruption.
5. No Cancellation Fees
We understand business priorities change. That is why EJN Labs never charges cancellation fees for postponed or cancelled penetration testing. You get total flexibility at no extra cost, making us unique among UK pentesting companies.
Our Proven Penetration Testing Methodology
Every engagement follows a proven, industry recognised process designed for maximum value and minimum business disruption:
- Scoping: We map your assets, risks, and compliance needs, ensuring the right penetration testing service for your environment.
- Planning: Collaborative setting of engagement rules, ensuring safety and clarity for all parties.
- Testing: Manual and automated testing using tools, techniques, and threat intelligence reflecting real-world attackers.
- Immediate Alerts: You get live access to new findings as they are discovered, no waiting weeks for a “final report.”
- Clear Reporting: Our detailed reports prioritise vulnerabilities by business risk, impact, and provide step-by-step remediation plans.
- Remediation & Retesting: Unlimited support and free retests until you are secure.
Why EJN Labs Is Trusted by UK Businesses
- Rapid Start: Begin your next pentest within 24 hours of engagement. Perfect for compliance deadlines or urgent board requests.
- CREST & CHECK Certified Consultants: All testing is performed by seasoned, UK-based consultants holding top security certifications.
- Integration Ready: We supply results in multiple formats and can integrate directly with your issue tracking or security management systems.
- Regulatory Focus: Methodologies mapped to ISO 27001, SOC 2, PCI-DSS, and Cyber Essentials Plus for easy audit and compliance.
Frequently Searched Questions
What are the benefits of penetration testing services?
Effective penetration testing services identify and quantify security risks in your environment, protect sensitive data, and satisfy regulatory/legal requirements.
How do I choose a penetration testing company in the UK?
Look for providers with a strong track record, CREST/CHECK/OSCP certified testers, transparent methodologies, and client-centric policies. EJN Labs ticks all those boxes, and does even more.
How much does penetration testing cost in the UK?
Penetration testing UK pricing ranges from £3,000 to £15,000 based on scope and complexity. EJN Labs charges clear daily rates, always with unlimited free retesting and expert support included.
Do I need pen testing services regularly?
Yes. Industry best practices recommend at least annual penetration tests, plus after major changes or suspected incidents.
Does EJN Labs provide penetration testing services in London and across the UK?
Yes, we are a London penetration testing company but serve clients UK-wide and globally.
Get Started with EJN Labs
If you are looking for a top penetration testing company in the UK with a proven reputation, innovative approach, and industry-first client terms, give EJN Labs a try. We are ready to help you meet compliance, build trust with customers, and defend your business—whether you need web application testing, external network pentesting, AI security assessments, cloud penetration tests, or ongoing threat intelligence.
Speak to an expert today or discover more on our website.
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