Current Project

Working at Oracle as Senior Principal Vulnerability Researcher, leading strategic security research initiatives for flagship mobile products securing 100M+ devices. Founded We Help You Secure, serving Fortune 100 clients across Healthcare, Defense, and Financial sectors.

View Profile

Hello, I am
Xavier D. Johnson

Vulnerability Researcher

Distinguished security leader with 14+ years driving enterprise-wide security initiatives. Pioneering vulnerability research, AI-powered security tools, and zero-day discoveries. Speaker at DEFCON and leading security conferences worldwide!

Core expertise

Vulnerability Research

Expert in iOS/macOS security research with focus on zero-day discovery. Pioneered novel sandbox bypass methodologies and exploitation techniques. Utilize advanced fuzzing infrastructure with AFL++, symbolic execution, and ARM architecture expertise to identify critical vulnerabilities in mobile platforms used by 100M+ users.

AI Security Solutions

Developed proprietary AI-powered Attack Surface Management platform that reduced false positives by 75% and accelerated critical vulnerability detection by 3x. Leading the integration of machine learning into security operations, creating innovative tools that transform how organizations identify and respond to threats.

Red Team Operations

Expertise in leading enterprise Red Team Operations for Fortune 100 companies. Directed long-term engagements for top 5 US banks, identifying critical infrastructure vulnerabilities. Built and scaled security practices from ground up, establishing testing standards and mentorship programs that improved team efficiency by 60%.

Watch Xavier D. Johnson on YouTube

Hello, I am
Xavier D. Johnson

Vulnerability Researcher / Speaker

Advanced Vulnerability Research

Advanced symbolic execution, iOS/macOS security, ARM architecture, and Mach-O exploitation. Pioneered novel sandbox bypass methodologies and exploitation techniques for iOS applications. Architected advanced fuzzing infrastructure using AFL++, identifying multiple zero-day vulnerabilities before external disclosure.

AI Security Solutions

Developed proprietary AI-powered Attack Surface Management (ASM) platform, reducing false positives by 75% and accelerating critical vulnerability detection by 3x. Built automated security testing frameworks and implemented enterprise-wide security automation platforms protecting 300K+ endpoints.

Red Team Operations

Led global Red Team operations for Fortune 100 companies across Healthcare, Defense, and Financial sectors. Directed long-term red team operations for top 5 US banks, identifying and remediating critical infrastructure vulnerabilities. Built and scaled security testing practices, growing business units by over 200%.

Industry Recognition & Impact

Regular speaker at premier security conferences including DEFCON 32 ("How to Find a 0day in iOS"), DEFCON 28 ("Automotive Ethernet for the Rest of Us"), and BSides Detroit. Published comprehensive guides on iOS application fuzzing methodology and contributed to security research publications.

Founded and scaled boutique security consultancy serving Fortune 100 clients. Established strategic partnerships with PwC and Bishop Fox. Taught advanced cybersecurity curriculum as Adjunct Professor at University of Michigan, mentoring the next generation of security leaders.

Connect On LinkedIn

Hello, I am
Xavier D. Johnson

Download My Resume

My Employment

Principal Vulnerability Researcher – Oracle [2022 - Present]

Lead strategic security research initiatives for flagship mobile product securing 100M+ devices. Pioneered novel sandbox bypass methodologies and exploitation techniques for iOS applications. Architected and implemented advanced fuzzing infrastructure using AFL++, identifying multiple zero-day vulnerabilities. Drive collaboration between research, engineering, and product teams to enhance security architecture.

Founder – We Help You Secure [2019 - Present]

Founded and scaled boutique security consultancy serving Fortune 100 clients across Healthcare, Defense, and Financial sectors. Developed proprietary AI-powered Attack Surface Management platform, reducing false positives by 75%. Established strategic partnerships with PwC and Bishop Fox. Directed long-term Red Team operations for top 5 US banks.

Adjunct Professor, Cybersecurity – University of Michigan [2020 - 2022]

Developed and taught advanced cybersecurity curriculum for cyber security students. Mentored next generation of security leaders, maintaining 95% positive student feedback.

Director, Security Services – Kivu Consulting [2019 - 2020]

Built and scaled security testing practice from ground up, growing the business unit by over 200% in the first year. Established testing standards and mentorship program, improving team efficiency by 60%. Launched innovative cloud compliance scanning service, establishing a new revenue stream.

Principal Red Team Lead – Dynatrace [2018 - 2019]

Led global red team operations, conducting advanced penetration testing across cloud, mobile, and IoT platforms. Developed automated security testing framework, reducing assessment time. Implemented CIS security standards across R&D operations, achieving over 95% compliance.

Staff Security Engineer – General Electric [2017 - 2018]

Architected enterprise-wide security automation platform, protecting 300K+ endpoints. Led Virtual Enterprise Security Sensor Grid initiative, optimizing security sensor deployment and reducing annual infrastructure costs by 30%. Established cloud security standards for public cloud deployments across business units.

DevSecOps Engineer – General Motors [2016 - 2017]

Pioneered CD pipeline creation, enabling secure software delivery to vehicle infotainment. Managed secure air-gapped LAN replicating GM and Verizon LTE infotainment WAN. Developed Native JavaScript test applications for "Chevy MyLink" compatibility testing. Created automated memory testing framework for rapid software delivery.

Principal – Infinite Development Solutions [2010 - 2017]

Spearheaded web application and software engineering initiatives. Developed over 50 applications, executed 75+ Penetration Tests, and conducted secure code reviews for 20+ clients. Facilitated company sale in collaboration with General Electric in March 2017.

Professional Training & Certifications

Mac & iOS Userspace Fuzzing – Stefan Esser

Advanced training in iOS/macOS vulnerability research, focusing on userspace fuzzing techniques and exploitation methodologies.

Advanced iOS Reverse Engineering & Exploitation – XINTRA

Comprehensive training in iOS reverse engineering, ARM exploitation, and advanced debugging techniques for mobile security research.

MVRE - Vulnerability Research Specialist – Mosse Institute

Specialized certification in vulnerability research, covering symbolic execution, fuzzing, and advanced exploitation techniques.

iOS & macOS Advanced Debugging – Kodeco

Deep dive into debugging techniques for Apple platforms, including kernel debugging and advanced instrumentation.

Speaking Engagements

DEFCON 32 – "How to Find a 0day in iOS" (2024)

Presented novel iOS vulnerability research methodologies and practical exploitation techniques to the security community.

DEFCON 28 – "Automotive Ethernet for the Rest of Us" (2020)

Delivered comprehensive analysis of automotive ethernet security vulnerabilities and attack vectors.

Hacking With The Homies – "Secure By Design: Application Scans in CI/CD" (2020)

Demonstrated integration of security scanning into DevSecOps pipelines for continuous security validation.

BSides Detroit – "Fileless Malware for Purple Teamers" (2019)

Explored advanced fileless malware techniques for red team operations and defensive countermeasures.

Security & Technical Expertise
  • iOS Hacking
  • Reverse Engineering
  • Binary Exploitation
  • Cloud Security
  • AI/ML Security
Download My Resume
© Copyright 2025 Xavier D. Johnson