Strengthen your security with our

expert penetration testing​.

Red Citadel helps companies find and fix security weaknesses before attackers can take advantage of them, with a clear rate of £1000 per day plus VAT. We keep the process practical, transparent and supportive from the first conversation through to remediation.

We provide Penetration Testing across Web Applications, Internal and External infrastructure, PCI-DSS environments, APIs, Mobile Applications, Artificial Intelligence / LLM, and Social Engineering. Cloud Security Auditing for AWS, Azure, Microsoft 365, Vulnerability Assessments and IASME Assessments for Cyber Essentials, Cyber Essentials Plus, and IASME Cyber Assurance.

What sets us apart is how we work: We share findings as we uncover them to avoid unnecessary report noise. We stay closely involved with your team throughout the engagement, offering guidance and collaboration rather than leaving you with a static document.

Our reports focus on clarity and real impact, where possible including video proof of how issues to help your team understand and fix them quickly. We also map findings to real attack paths so you can prioritise what matters based on your company’s risk appetite.

There are no vague quotes, no hidden extras and no jargon. You always know where you stand, and you get a testing process that is clear, efficient and genuinely helpful.

Whether you’re a small business or a growing enterprise, we’re here to help you stay secure, compliant, and happy.

CREST Certified

Industry recognised
code of conduct

Secure Testing

Helping to protect
your data and systems

Thorough Analysis

Comprehensive
security reviews

Proven Results

Actionable findings
without bloat

Our Services

We deliver security solutions with precision, integrity, and dedication.

Our experienced team takes the time to understand your challenges, every engagement is thorough, efficient, and shaped around what you need. You can rely on us to work with discretion and honesty, and to put in the extra effort that keeps you protected.

Whether you need your systems penetration tested, cloud environments audited, or support with Cyber Essentials, we make each step clear and simple. With us, you gain a partner who treats your security and priorities with the same care that you do.

Web Application Penetration Testing

Our experts identify security flaws in your websites & applications, including authentication weaknesses, logic flaws, and code vulnerabilities, helping you safeguard users and business data.

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Internal Infrastructure Penetration Testing ​

We simulate insider threats & compromised devices on the network to uncover vulnerabilities before attackers do. This ensures your internal systems and sensitive data remain protected.

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External Infrastructure Penetration Testing ​

Our team tests your internet-facing systems from an attacker’s perspective, exposing vulnerabilities and weaknesses that could lead to a breach. Helping to secure your perimeter and assets.

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PCI-DSS Penetration Testing

We conduct targeted testing aligned with PCI-DSS requirements to assess the security of cardholder data environments to help validate compliance and a secure payment processing environment. 

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API Penetration Testing

We test the security of your APIs, identifying flaws such as weak logic errors, authentication, and data exposure. This helps safeguard sensitive data and ensure reliable integrations.

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Mobile Application Penetration Testing

We test mobile applications across iOS and Android. Our testing covers storage, authentication, and API communication. This helps your applications stay secure, resilient, and able to protect user data.

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Social Engineering Penetration Testing

We assess how well your staff and processes resist real world social engineering. Through controlled phishing, vishing and impersonation, we uncover gaps in awareness and help improve your human defences.

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AI / LLM Penetration Testing

We test AI and LLM-powered systems to identify prompt injection, unsafe outputs, and integration risks, helping secure your models, data, and applications.

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M365 Security Audits​​

We review & harden your Microsoft 365 environment, ensuring security controls such as MFA, access policies, and data protection are correctly implemented and resilient against attack.

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Azure & AWS Cloud Security Audits

We assess the security of your cloud platforms and configurations, identifying risks such as misconfigurations, identity issues, and access exposures across Azure and AWS.

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Vulnerability Assessment Scans

We perform comprehensive scans to detect misconfigurations, missing patches, and common weaknesses. Our clear reporting helps you prioritise fixes and reduce your attack surface.

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IASME Cyber Essentials ​​Assessments

We guide you through achieving certification, helping you meet UK government-backed security standards. Demonstrate compliance, reduce cyber risk, and build trust with your clients.

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What sets us apart from the competitors?

We blend technical expertise with an understanding of what our clients need.

Take a look below at what we believe truly sets us apart:

Agile Delivery of Findings


We don’t wait until testing is complete to deliver results.

We give short daily round-up meetings to share findings of any level of criticality, enabling you to act quickly and efficiently before the final report is produced.

These sessions also help eliminate false positives or misunderstandings that could otherwise unnecessarily bloat the report.

Clear and Actionable Insights


More than just a PDF.

In addition to pre- and post-test support and detailed reports, we provide video proof-of-concepts to demonstrate exactly how vulnerabilities can be exploited in the real world.

This allows you to quickly understand the impact and makes it easier to share findings with internal teams, helping to accelerate development and resolution times.

Mapped to Real-World Threats


Our findings aren’t just CVSS scores.

Where possible, we map each vulnerability to real-world threats, showing how they could be exploited.

By aligning this with your company’s risk appetite and existing knowledge, we help you understand the true impact of vulnerabilities. This enables your team to prioritise remediation, make informed decisions, and strengthen defences against active attacks.

Hands-On Collaboration


We work closely with your team throughout the engagement.

From the initial quote, pre-testing checks, through the testing process, supporting remediation and knowledge transfer every step of the journey.

You’re not just buying a penetration test, you’re buying collaboration and support too.

Get In Touch

Our team are ready to help you strengthen your company and systems.

Whether you are launching a new platform, expanding an existing service, or reviewing your defences, we can provide a tailored engagement that meets your needs.

Contact us today to discuss your requirements and see how we can help you protect your business with confidence.

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