SEJOYNER JOY

CYber Security Engineer

"Single vulnerability is all an attacker needs..."
~?

Get in Touch View Projects

About Me

A passionate Cyber Security Enthusiast with over 4 years of experience in vulnerability assessment and penetration testing, bug hunting, and ethical hacking. Expertise in identifying and mitigating security vulnerabilities in web applications and other systems.

Throughout career, helped organizations strengthen their security posture through comprehensive security assessments and ethical hacking. Specialize in:

  • Web Application Security Testing
  • Vulnerability Assessment
  • Penetration Testing
  • Network Security
  • Manual and Automated Security Testing
  • Bug Hunting
  • Ethical Hacking
  • Security R&D

Expertise

Web Security

Comprehensive web application security assessment, penetration testing, and vulnerability management using industry-standard tools and methodologies.

Mobile Security

Android and iOS security assessment, reverse engineering, and vulnerability analysis for mobile applications.

Network Security

Network infrastructure security, firewall configuration, and security architecture design and implementation.

API Security

REST and GraphQL API security testing, authentication/authorization assessment, and secure API design implementation.

WordPress Security

Comprehensive WordPress security assessment, plugin auditing, theme hardening, and implementation of security best practices.

Projects

Web Security Project

Conducted a comprehensive security assessment for a major applications.

  • Identified and remediated critical vulnerabilities
  • Enhanced application security architecture
  • Implemented secure coding practices
  • Reduced security incidents by 70%
  • Developed security documentation and policies

Mobile App Security

Led security assessment for mobile applications.

  • Performed reverse engineering and vulnerability analysis
  • Identified and fixed API vulnerabilities
  • Implemented secure coding practices
  • Enhanced app security architecture

Network Security Project

Conducted comprehensive network vulnerability assessment and penetration testing.

  • Performed network infrastructure VAPT and identified critical vulnerabilities
  • Conducted security assessment of network devices and services
  • Tested network segmentation and access controls
  • Reduced attack surface by 40% through vulnerability remediation

API Security Testing

Conducted comprehensive security assessment for REST and GraphQL APIs.

  • Identified and remediated critical API vulnerabilities
  • Enhanced API security architecture
  • Implemented secure API design practices
  • Improved authentication and authorization mechanisms
  • Developed API security documentation and policies

AI/ML Security Testing

Conducted comprehensive security assessment for AI/ML systems and models.

  • Identified and remediated model vulnerabilities and adversarial attacks
  • Enhanced AI/ML system security architecture
  • Implemented secure model deployment practices
  • Improved data privacy and protection mechanisms
  • Developed AI/ML security documentation and policies

Reporting and Documentation

Developed comprehensive security assessment reports and documentation.

  • Created detailed vulnerability assessment reports
  • Documented security findings and remediation steps
  • Developed security policies and procedures
  • Enhanced security documentation and guidelines
  • Improved security awareness and training materials

Achievements

Bug Bounty Recognition

Received bounties and acknowledgments from various private bug bounty programs and companies.

  • Identified and reported critical security vulnerabilities
  • Recognized for responsible disclosure practices
  • Contributed to improving application security

HackTheBox Elite

Demonstrated advanced skills in penetration testing and cybersecurity challenges.

  • Earned the Elite Hacker badge on HackTheBox
  • Mastered various cybersecurity challenges
  • Advanced penetration testing skills

Hall of Fame Recognition

Recognized by multiple organizations for security contributions.

  • Red Bull
  • United Nations
  • Inflectra.com
  • Nokia
  • Surf.nl

HackerRank Excellence

Achieved global recognition in programming and system administration.

  • Global Rank 1 in Python
  • Global Rank 1 in Linux Shell (Bash)
  • Demonstrated exceptional coding skills

Cyber Security Mentor

Shared knowledge and expertise with the cybersecurity community.

  • Speaker at different hacking communities
  • Presented on Web Penetration Testing
  • Contributed to security education

Get in Touch

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