About the Service:
We perform focused, methodical penetration testing that reflects real-world attacker behaviour. Each engagement identifies critical vulnerabilities, validates existing security measures, and provides prioritised, actionable remediation steps.
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This service tests your systems the way an attacker would, to find weaknesses before they are exploited. You receive clear results, practical fixes, and a plan to reduce exposure quickly.
What’s Included:
Web application and API testing. Network and cloud assessments. Threat modelling and attack-path analysis. Clear remediation reporting. Optional retesting to validate fixes.
Who this Service is for?
Recommended for organisations releasing new applications, preparing for regulatory compliance, undergoing audits, responding to client security requirements, or validating internal security controls.
Work Process
Penetration Testing Oversight
We provided governance and coordination for penetration testing activities to ensure structured delivery, clear reporting and meaningful remediation outcomes for a large SAP operations business.
Comprehensive Security Reviews
We carried out full spectrum security reviews for clients seeking a clear understanding of their current security posture and practical steps to improve resilience. The assessments covered governance, technology and operational controls.
Hedge Fund Spin-out MSP Selection
We supported a newly formed hedge fund in selecting the right managed service provider by conducting an objective assessment of multiple proposals. This ensured a reliable long term partner aligned to the firm’s operational needs.
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Ninth Seat
“Onion Security worked alongside our existing IT supplier to provide an independent and constructive view of our security position. Their assessment helped us understand where we could strengthen our controls and prioritise future improvements. The guidance they provided was clear, practical and collaborative throughout. We now have a well-defined roadmap that supports our ongoing security strategy, and we are keen to work with them again to ensure we stay ahead of the ever-changing security threats."
Tim Gowing
FryerMiles
"Working with Onion Security has given us greater clarity and structure around how we protect candidate and client information. They made a real effort to understand the flow of data within our recruitment operations and offered guidance that suited the way our teams work. Their steady, knowledgeable support has strengthened our overall approach to security, and we value their ongoing role in helping us maintain strong and compliant practices."
Leo Miles
SportsFi
"Onion Security have been instrumental in guiding us through our ISO 27001 and SOC 2 journey. Their expertise, combined with effective tooling solutions, has helped us build clear and manageable compliance processes. We value the reassurance and support they provide at each stage, and they continue to play a key role in our ongoing security and compliance work."
Justin King
Cunningham Eves Solicitors
"Onion Security supported our firm with clear, practical advice focused on safeguarding client confidentiality and meeting the expectations of our regulators. They quickly understood the nature of our legal work and provided guidance that fitted seamlessly with our existing processes. Their professionalism and measured approach have given us greater confidence in our security arrangements, and they remain a trusted resource for ongoing security and compliance matters."
Christine Eves
Construction Dynamics Solutions
“Onion Security invested the time to understand our firm, our workflows and the expectations of our clients. This allowed them to tailor their support precisely to our needs and provide guidance that was both practical and proportionate. Their work has helped us strengthen our security posture and gain clearer oversight of our compliance obligations. We value their measured, professional approach and are pleased to have them as our trusted security and compliance partner.”
Sam Mattar
Codertonic
"Onion Security provides expert support across our security and compliance needs, including thorough penetration testing that offers valuable insight and assurance. Their advice is clear, reliable and aligned with the way we work, which strengthens our approach without disrupting our development process. They have become a trusted partner for security matters, and I would not hesitate to recommend them."
Chris Hoyes
What types of penetration testing do you offer?
Application, infrastructure and cloud focused penetration testing scoped to your environment and risk profile.
How is penetration testing different from automated scanning?
Automated scanning identifies known issues. Penetration testing validates real world exploitability and business impact.
Will penetration testing disrupt our systems?
Testing is carefully planned to minimise disruption. High risk techniques are agreed in advance.
Do you provide remediation guidance?
Yes. Findings include prioritised remediation guidance for both technical and non-technical audiences.
Can you retest once issues are fixed?
Yes. Retesting confirms vulnerabilities have been properly resolved and supports audit or customer assurance.
How often should penetration testing be performed?
Penetration testing should be performed annually at a minimum and more frequently depending on industry, threat landscape and regulatory or customer expectations.
Your Trusted Partner
