Hire the Best Web Application Security Freelancers
in the United Kingdom

Automated tools are necessary, but they aren't sufficient. To truly secure your application, you need a human tester who understands business logic and complex exploit chains. I am a certified offensive security specialist focusing on Web Application and API penetration testing. I provide the manual verification required for SOC2, ISO 27001, and HIPAA compliance, ensuring your team doesn't waste time chasing false positives. Core Competencies: Manual Exploitation: Identifying logic flaws, privilege escalation, and IDORs that scanners cannot find. Detailed Remediation: I speak your developers' language. My reports include reproduction steps (PoC) and code-level mitigation advice. Compliance: Structured testing methodologies aligned with industry standards. Certifications: OSCP (Offensive Security Certified Professional) CREST Registered Penetration Tester BSCP (Burp Suite Certified Practitioner) If you need a clear, actionable security assessment without the jargon, let's connect.

I help founders and CTOs launch securely with confidence, guided by an industry-recognised expert in web, API & AI security. CREST & OffSec certified Web App & API Penetration Tester. 10+ years experience, 200+ tests, 300+ responsible disclosures. I help founders understand what actually puts their product and users at risk, without drowning them in technical noise. My approach goes far beyond a traditional penetration test - I give teams the clarity they need to deploy new applications, functionality and features to their customers without worrying about security. 🤝 Organizations I’ve helped secure: 𝐀𝐦𝐚𝐳𝐨𝐧 𝐀𝐖𝐒 𝐍𝐯𝐢𝐝𝐢𝐚 𝐓𝐢𝐝𝐞 𝐘𝐢𝐞𝐥𝐝𝐬𝐭𝐫𝐞𝐞𝐭 𝐒𝐭𝐫𝐢𝐩𝐞 𝐕𝐢𝐫𝐠𝐢𝐧 𝐌𝐞𝐝𝐢𝐚 𝐎𝟐 𝐃𝐫𝐨𝐩𝐳𝐨𝐧𝐞 𝐀𝐈 Services 🛡️ Web Application Penetration Testing Manual, attacker-mindset testing to uncover real-world vulnerabilities and logic flaws, including VAPT testing. 🔗 API Penetration Testing (REST & GraphQL) Auth flows, rate-limit bypass, schema misuse, injection paths, privilege escalation, and more. 🧪 SaaS Penetration Testing Testing focused on multi-tenant risks, permission abuse, data exposure, and tenant isolation issues. 📦 SaaS Product Security Assessment Comprehensive reviews for teams preparing for launch, onboarding customers, or SOC2 readiness. 🔎 OWASP Top 10 & SOC2-Aligned Web Application Security Reviews Industry-standard testing aligned with compliance and enterprise expectations. 🔍 Manual Vulnerability Discovery Deep human-led testing for IDOR, SSRF, XSS, BOLA, deserialization, logic flaws, and chained vulnerabilities. Deliverables 📝 Executive summary: High-level overview of findings, risk, and how to address them. 📄 Finding overview: Clear, reproducible details for developers (risk, impact, steps to reproduce). 🛠️ Remediation steps: Concrete, prioritized fixes your team can implement immediately. If you're preparing to launch and want a definitive understanding of your real-world security risks, let's talk.

Hi, I’m Martin — a Principal Penetration Tester with over 13 years of hands-on experience (since 2011). I’ve delivered high-impact security assessments for clients ranging from innovative startups to global enterprises across the UK, Europe, East Asia, and the Middle East. My expertise spans the full spectrum of offensive security, including: • Web Application Penetration Testing • Mobile Application Penetration Testing • API Penetration Testing (REST, SOAP, GraphQL) • Thick Client & Desktop Application Testing • External & Internal Infrastructure Penetration Testing • Cloud Security Assessments (AWS, Azure, Office 365) • Red Team Operations & Simulated Phishing • Wireless Assessments, IoT Security, and Embedded Hardware • Server & Workstation Build Reviews • Mobile Device & MDM Testing • Network Device Security Reviews What sets me apart is my depth of experience combined with a relentless, methodical approach. As a Tigerscheme and CREST certified penetration tester, I stay at the forefront of evolving threats and techniques. I don’t just find vulnerabilities I provide clear, actionable insights that help organisations meaningfully strengthen their security posture. In addition to technical excellence, I’m a strong communicator who excels at translating complex findings into clear, business-relevant language. I work closely with clients to understand their unique risk landscape and deliver tailored testing programs that align with their objectives. I run a professional, focused penetration testing company and take great pride in the quality of our deliverables. All engagements include comprehensive, high-standard reports (example reports available upon request). I am also a Cyber Essentials and Cyber Essentials Plus Assessor and work with a recognised certification body. Top Rated on Upwork, I’m known for consistent quality, clear communication, and delivering real value. Whether you need infrastructure testing, web/mobile application assessments, API reviews, cloud configuration audits, or full Red Team exercises. I’m here to help you identify and mitigate risks before attackers do. Feel free to reach out, I would be happy to discuss how I can support your security needs.

That vulnerability your scanner flagged last? It already missed three others. Automated tools were built for speed, not depth. They catch surface-level issues and hand you a report full of findings that look thorough but leave the real risks untouched. Business logic flaws, broken access controls and chained API vulnerabilities are not things a scanner reasons though they require someone who thinks like an attacker and understands how applications are actually built. With 15 years of web application penetration testing experience and both OSCP and OSWE certifications, the vulnerabilities that matter most are exactly what gets found here. ✅ OSCP and OSWE certified with 15 years of hands-on web application penetration testing ✅ API security testing across REST, GraphQL, BOLA, JWT and OAuth attack surfaces ✅ Full OWASP Top 10 coverage using real working exploits, not recycled scan output ✅ Business logic flaws, auth bypasses and access control gaps that no scanner will catch ✅ SaaS, fintech and startup clients across the US, UK, Europe and Australia ✅ Virtual CISO support for SaaS, fintech and AI companies without a full-time security hire ✅ ISO 27001 implementation and ISMS structuring to pass audits and satisfy enterprise buyers ✅ Security questionnaires handled end-to-end so compliance never stalls a deal ✅ Audit-ready policies, procedures and control frameworks beyond checkbox compliance ✅ Hands-on GRC platform work across Vanta, Drata, Secureframe and Thoropass Certifications: ✅ Offensive Security Certified Professional (OSCP) ✅ Certified Ethical Hacker (CEH) ✅ eLearnSecurity Junior Penetration Tester (eJPT) ✅ GIAC Penetration Tester (GPEN) ✅ Offensive Security Web Expert (OSWE) ✅ GIAC Web Application Penetration Tester (GWAPT) ✅ Certified AppSec Practitioner (CAP) ✅ AWS Certified Security – Specialty ✅ Microsoft Certified: Azure Security Engineer Associate Here's the thing: most penetration testing engagements produce the same report. Same ten findings, same scanner, same template. That is not useful to a development team trying to fix real problems, and it is not useful to a business trying to understand real risk. The vulnerabilities that lead to actual breaches live inside application logic, API design and access control architecture. Finding them requires manual testing, genuine attack thinking and an understanding of where developers cut corners under deadline pressure. Web Application Penetration Testing Testing covers the full attack surface authentication, session management, input validation, business logic, access control and injection vulnerabilities mapped across the complete OWASP Top 10. Burp Suite Professional, OWASP ZAP, Nuclei, ffuf, SQLmap and XSStrike are used alongside deep manual testing to find chained vulnerabilities and logic flaws that no automated tool reaches on its own. Scope covers single-page applications in React, Angular and Vue, backend platforms including PHP, Node.js, Python, Java and .NET, and extends into microservices and cloud-native environments across AWS, Azure and GCP. API Security Testing Every REST and GraphQL endpoint gets tested for broken object-level authorisation, excessive data exposure, broken function-level authorisation, mass assignment, JWT vulnerabilities, OAuth misconfigurations and rate-limiting bypasses. Testing covers both technical weaknesses and business logic abuse, not just surface HTTP checks that any scanner can run. GraphQL engagements go further into introspection abuse, batching attacks, nested query exploitation and field-level authorisation gaps. Application Security Audit and Vulnerability Assessment Every audit combines manual penetration testing with SAST via Semgrep, SCA via Snyk and container scanning via Trivy to deliver a full picture of code-level, dependency and infrastructure risk. Findings are prioritised by real exploitability and business impact, not by CVSS score alone. Compliance-Aligned Testing Audit work maps directly to OWASP ASVS, SOC 2, GDPR and NIST CSF requirements — useful for SaaS companies approaching enterprise sales, startups preparing for investor due diligence and platforms handling regulated or sensitive user data. All findings are documented with detailed technical evidence, including proof-of-concept exploitation steps, affected endpoints, request/response analysis, and attack flow breakdowns where applicable. The reporting structure is designed to support engineering teams in reproducing and fixing issues efficiently, with clear mapping to OWASP Top 10 and relevant security controls. Each vulnerability includes prioritized remediation guidance, validation notes Send a message to discuss scope. A short conversation is all it takes to get started.

I am a globally acclaimed Cyber security consultant and Internet Security Specialist with a proven track record in security engineering and discovering Critical Zero Day Security Issues in a significant number of Web Applications, Products and Browsers which have helped protecting Privacy and Security of millions of users globally. My research on Cyber Security has been featured in BBC, Forbes, WSJ, Tech Crunch and many International media outlets. My mission is to fortify your digital defenses by harnessing the power of cutting-edge AI/ML technologies. I currently hold the following educational degrees and certifications: ✅ Masters in Cyber-Security and Forensics ✅ Certified Information Systems Security Professional (CISSP) ✅ Certified Information Security Auditor (CISA) ✅ Offensive Security Certified Professional (OSCP) ✅ CREST Practitioner Security Analyst (CPSA) ✅ Offensive Security Web Expert (OSWE) ✅Offensive Security Wireless Professional (OSWP) Security/Compliance Frameworks: ISO 27001, SOC2, PCI-DSS, HIPAA, NY DFS 23/ NYCRR Part 500, NIST, CIS, GDPR, HIPAA, FedRAMP, NIST 800-53, NIST 800-171, NIS2, DORA Services I Offer: Penetration Testing Vulnerability Assessment PCI-DSS SAQ Filing + ASV PCI compliance assessment Cloud Security (AWS, Azure and GCP) Red Teaming Assessment Threat Modelling Security Architecture Review Web 3.0 Wallet Security Smart Contract Audits Cloudflare WAF Protection DDOS Protection Expert Bot Protection Expert Cyber Essentials Cyber Essentials Plus

✅ Protect your website, SaaS platform, or IoT system from hackers. I deliver penetration testing + clear reports that keep your business safe and compliant. I’m a cybersecurity consultant helping businesses, startups, and SaaS platforms secure their websites, web applications, and digital products against today’s evolving threats. With an MSc in Cybersecurity (UK) and hands-on project experience, I deliver penetration testing + clear business-ready reports that help clients strengthen security without drowning in technical jargon. 🔹 Services I Offer Website & Web Application Security Testing (WordPress, SaaS, APIs) Penetration Testing (Web, Cloud, Network, IoT) IoT & Embedded Device Risk Audits Secure Architecture Reviews (STRIDE, SaaS, cloud platforms) Malware / Vulnerability Assessments & Compliance Reports Detailed Reporting (CVSS scores, PoCs, and step-by-step remediation) 🔹 Recent Work Audited an e-reader app for token manipulation, DRM bypass, and scraping resistance. Compared IDS tools (Snort vs Suricata) for high-throughput network monitoring. Delivered red-team simulations using Kali Linux, Burp Suite, Nessus, and Metasploit. 🔹 Why Clients Hire Me MSc Cybersecurity (Distinction, UK) + real-world Upwork client results Tools: Burp Suite, ZAP, Wireshark, Nessus, Snort, Suricata, Ghidra, Splunk Clear communication for both executives & technical teams 100% satisfaction or money-back guarantee 💬 Let’s discuss your project — I’ll help secure your website, app, or IoT system with expert-led testing and compliance-ready reporting.