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Wednesday 10 Dec 2025
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"Moving to E5 has been really good from a security point of view... Now we can get a holistic view of what’s going on, which helps us to make changes and recommendations for future plans."

IT Service Manager
Ian Harkess
Trusted by industry leaders
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Please note: A minimum of 150 enterprise licenses is required for FastTrack eligibility.
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“We needed to find solutions to a variety of issues whilst being a complex business, operating in a 24/7 environment. Stripe OLT listened and understood immediately the challenges we faced.”

IT Operations Manager
Simon Darley
Trusted by industry leaders

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Call us on one of the numbers below, we cover the whole of the UK, so call the nearest office.

BriSTOL HQ & The South West

London & Surrounding Areas

Manchester & the North

“We needed to find solutions to a variety of issues whilst being a complex business, operating in a 24/7 environment. Stripe OLT listened and understood immediately the challenges we faced.”

IT Operations Manager
Simon Darley
Trusted by industry leaders
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CREST Certified Penetration Testing Services

Our pen tests are offensive cyber security assessments conducted by CREST certified ethical hackers. These tests are carried out to discover and exploit potential vulnerabilities in an organisation’s business systems.
Proven 5-step testing process, using real-world attack pathways 
Custom testing for web apps, cloud, infrastructure, and more.
UK-based CREST-certified team
Cyber Essentials Plus certified
Interactive reporting dashboard and delivery workshop
Support compliance requirements such as GDPR
GIAC Security Essentials Certification
Microsoft Security Partner
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ISO 27001 Certification
Certificationser Essentials Plus Certification
What are pen testing services
Pen Testing Areas
Benefits
Methodology
Why Stripe OLT?
Penetration Testing FAQs

Our
Awards

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Megabuyte Top 50 Emerging Companies 2024
Cloudtango MSP UK Select 2024 Award
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This web app assessment has been vital to our business. Not only were we taken through any potential risks, but we were also given thorough guidance on how to mitigate them, in a language we were able to understand. Being given this information has been invaluable in ensuring our data is protected.

Coller Capital

What are Penetration Testing SErvices?

Penetration Testing Services are crucial for organisations that want to take their cyber security seriously.

A penetration testing service, also known as a pen test, is a type of offensive security test carried out to discover and exploit potential vulnerabilities in an organisation’s technical systems. These tests involve scrutinising internal IT systems and exploring anything from an organisation’s network infrastructure to its web applications, all with the intention of identifying vulnerabilities.

Penetration tests blend automated and manual techniques to simulate real-world attacks and discover active security weaknesses.

An Overview of Penetration Test Types

With a variety of penetration testing services and solutions available, many SMEs are unsure where to begin, or which type of pen test will best suit their needs.

That’s why at Stripe OLT, we offer a multitude of penetration testing solutions to cover a wide range of cloud and on-premises IT systems.

Some clients choose one, some combine them all – depending on your unique requirements, we can build a penetration test around your immediate needs.

Mobile

Secure your mobile applications against emerging threats with comprehensive mobile security testing that covers both iOS and Android platforms.

Web Application

Protect your web applications from sophisticated cyber threats with in-depth automated testing that identifies and mitigates vulnerabilities.

Cloud

Strengthen cloud security with targeted penetration testing to identify and mitigate vulnerabilities in cloud services and applications, including Azure, AWS and GCP.

Network

Safeguard your network against intrusions and attacks with rigorous testing that examines both internal and external network threats.

Wireless

Defend your wireless networks from unauthorised access and eavesdropping with targeted testing that strengthens your wireless security protocols.

Infrastructure

Ensure the security posture of your physical and virtual infrastructure with detailed assessments that uncover potential weaknesses.

Expanded Testing AReas

Many more types of penetration testing services are available, each designed to identify different security weaknesses. Stripe OLT can help you with tailored pen tests in these areas:
External
Internal
Apps and software
Email and web servers
Firewalls
Attack surface
Physical Security
API
Websites
Wi-Fi
IoT and devices

What are the Benefits of Penetration Testing Types?

Why does your organisation need a penetration test?
Identify vulnerabilities: Pinpoint security weaknesses in networks, infrastructure, web applications and devices before attackers can.
Enhance your security measures: Strengthen existing security protocols by finding weaknesses.
Compliance assurance: Regular pen testing helps ensure compliance with industry standards and regulations, reducing legal and financial risk.
Protect critical assets: Security testing identifies cyber risks in important business assets, helping safeguard against data breaches or losses.
Cost-effective security strategy: Mitigating vulnerabilities early reduces the risk of breaches and the financial and reputational costs that come with them. The cost of penetration testing is far less.
Bolster cyber defences: Prepare and improve defences against ever-evolving cyber threats and attacks.
Gain trust: Build stakeholder, partner and customer confidence by demonstrating a commitment to security through regular pen testing.
CREST & CHECK certified: Using CREST and CHECK certified penetration testers ensures an ethical and thorough test to high standards.
Customisable testing scope: Penetration testing services can be tailored to your business needs. Target important areas or assets such as cloud systems or web applications.
Detailed report: Stripe OLT’s pen testing services provide detailed reports with actionable insights to aid in strategic security planning and implementation.

Highly certified security analysts

CREST – the Council of Registered Ethical Security Testers – is an international accreditation and certification body, representing and supporting the best of the technical information security industry.

What are the Different Types of Penetration Testing Services?

Mobile application penetration test

Our mobile application penetration testing service assesses apps built for Android, iOS (and other common operating systems) against recognised security vulnerabilities that frequently affect mobile app architectures.

Mobile security testing services will:
Uncover insecure app functionality and misconfigurations, such as insufficient cryptography
Exploit potential weaknesses in applications, such as insecure data transmission
Secure and safeguard your software development lifecycle
Provide actionable insights into potential improvements

Web application penetration test

A web application penetration test aims to identify security vulnerabilities that stem from insecure development practices, for example, from the design, coding and publishing of plugins or websites.

Web application security testing services will:
Test user authentication to verify a variety of accounts
Assess your web applications for vulnerabilities, such as XSS
Help to safeguard web server security and database server security
Assess the configuration and security of web browsers 
Provide actionable insights into potential improvements

Cloud infrastructure penetration test

Cloud penetration testing is the process of detecting and exploiting security vulnerabilities in your cloud infrastructure. Our cloud pen test is performed under strict guidelines from cloud service providers such as Microsoft Azure, AWS and Google Cloud.

Cloud security testing services will:
Uncover insecure APIs
Test for potential server misconfigurations
Identify weak credentials that may pose a security risk
Discover risks associated with outdated software
Provide actionable insights into potential improvements

Internal & external network penetration test

Network penetration testing, also known as infrastructure penetration testing, can be conducted from two angles: inside and outside your organisation’s network perimeter.

Network security testing services will:
Uncover insecure configuration parameters
Test against insufficient firewalls
Identify unpatched systems and software flaws
Uncover weak encryption conventions
Provide actionable insights into potential improvements

Wireless Penetration Test

Our wireless penetration testing service identifies and examines the connections between all endpoints and devices connected to your organisation’s Wi-Fi, including desktops, laptops and smartphones.

Wireless security testing services will:
Identify vulnerabilities affecting your wireless infrastructure
Show how an attacker could move through your wireless infrastructure, escalating their privileges and compromising your corporate network
Provide actionable insights into where improvements can be made

Penetration Testing Methodology

1

Reconnaissance & Information Gathering

We start by collecting detailed information about your environment to identify potential targets and vulnerabilities.
2

Scanning & enumerations

Using advanced tools, we scan your systems to enumerate services, applications and underlying infrastructure, pinpointing areas for deeper analysis.
3

ACCESS & EXPLOITATION

Our team simulates real-world attack scenarios to access and exploit identified vulnerabilities, assessing the potential impact on your infrastructure.
4

EXPANSION & ACCESS MAINTENANCE

We explore the extent to which the breach can be expanded and how long unauthorised access can be maintained, revealing the depth of potential security issues.
5

SYSTEM CLEANUP & REPORTING

After testing, we ensure all systems are returned to their original state. A detailed penetration test report outlines our findings and recommends actionable steps for remediation and enhancement.

Elevate your cyber security game

Contact us today to fortify your business with our penetration testing services.

Looking for a Red Team assessment?

With our Red Team assessment, our ethical hackers replicate known cyber-attack techniques, tactics and procedures (TTPs), acting as adversaries to challenge the strength of your people, processes, technology and physical security.

What Our Clients Say

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Geo

How we stress-tested their infrastructure and web apps
Geo is a smart energy pioneer aiming for net zero. They needed assurance that their infrastructure and customer-facing applications were resilient. We executed external, internal and web app penetration tests, simulating real-world attacker tactics to identify vulnerabilities and provide mitigation strategies.

Want to see how we helped Geo uncover hidden risks and strengthen their cyber defences through penetration testing? Click below.
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Coller Capital

How we uncovered vulnerabilities with CREST-level penetration testing
Coller Capital needed to evaluate their security posture and reduce risk. We delivered comprehensive web application penetration testing, aligned to CREST standards, to simulate real-world attacks, identify weaknesses and provide clear remediation guidance.

Want to see how we helped Coller Capital strengthen their cyber defences through expert penetration testing? Click below.
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Penetration Testing FAQs

What is penetration testing and how can it protect my business?
Penetration testing, also known as ethical hacking or pen testing, is a proactive security assessment technique conducted to identify vulnerabilities and assess the effectiveness of an organisation’s security controls. It involves simulating real-world attack scenarios to evaluate the security posture of an organisation’s networks, systems, applications or infrastructure.

Penetration testing is a vital tool for organisations as it uncovers weaknesses in infrastructure, applications or network configurations. It tests for vulnerabilities such as software flaws or misconfigurations, providing insights into potential entry points for attackers. Critically, it also assesses the effectiveness of security controls such as firewalls, intrusion detection systems and access controls. Weaknesses or gaps can then be identified and addressed to strengthen overall security.

As penetration testing is key to securing your systems, be sure to choose tried and tested providers – particularly CREST-accredited ones – as they deliver backed services and have the technical expertise to uncover the complex vulnerabilities that modern attackers exploit.

Why Choose Stripe OLT to Conduct Your Penetration Test

Award-Winning

We’re an award-winning managed services provider

With over 20 years of experience, we’ve built a reputation we’re proud of. Winning awards for both our managed IT and managed security services means we don’t just claim to be experts. With Stripe OLT, you are guaranteed an exceptional experience.

We are one of the top managed service providers for small and medium-sized businesses. We consistently achieve industry-leading customer satisfaction scores, with a dedicated focus on cyber security and IT support services.
UK Based

Your Trusted UK Cyber Security Partner

We are a full-service managed IT provider based in London, Bristol and Manchester, underpinned and led by ITIL-accredited engineers with deep expertise in Microsoft cloud and security technologies.

Our knowledgeable and highly qualified IT support engineers deliver a next-level service, consistently recognised through fantastic client feedback.

Our team supports organisations with their cybersecurity across the UK and beyond
Security Experts

highly certified security Team

We employ both ex-government and military veterans, we ensure our clients are protected by the best. Our engineers are IASME, CREST and Microsoft security certified (among others), consistently performing at a high level, 24/7.
Microsoft Specialists

Certified Microsoft Solutions Partner

At Stripe OLT, we’ve invested heavily in Microsoft certifications over the past three years. As a result, we are now one of the UK’s leading Microsoft partners in cloud and cyber security solutions, holding Microsoft Solutions Partner status in both Modern Work and Security.

Whether you need to enhance collaboration with applications such as SharePoint and Teams, or secure your environment with Azure Sentinel, you can trust our highly certified Microsoft team.
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