Hire the Best Web Application Security Freelancers
in the United Kingdom

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.

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.

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

✅ 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.

Full-Stack Developer and Security Engineer with proven experience delivering scalable, secure, and high-quality digital solutions. My background combines software engineering, cybersecurity, and project management to ensure each build is both technically strong and strategically executed. Full-Stack Development - Modern applications built with TypeScript, Node.js, React, and Python - Integration with APIs, databases, and cloud platforms - CMS solutions in WordPress, Shopify, and Webflow Cybersecurity & Compliance - Vulnerability Assessment & Penetration Testing (VAPT) - ISO 27001, GRC, and security auditing - Risk-based consulting to help teams meet compliance and strengthen defences Quality and reliability define my work as every project is built to perform, scale, and endure.