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Hello, I'm

Sefat Khan

And I'm a |

Expert Ethical Hacker & Cybersecurity Specialist helping organizations find and fix vulnerabilities before attackers do. From penetration testing and vulnerability assessment to security research and defense‑in‑depth, I deliver practical cybersecurity improvements and clear, actionable security reports.

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🎯 Core Skills & Expertise

⚡ 🔥 💫

Comprehensive capabilities spanning cybersecurity, programming, design, and creative technologies

🛡️

Ethical Hacker

Expert

Advanced penetration testing, vulnerability assessment, and ethical hacking methodologies to identify and remediate security weaknesses.

5+ Years
100+ Tests
Expert Level
Penetration Testing OWASP Burp Suite Metasploit
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🔒

Cyber Security Specialist

Advanced

Comprehensive cybersecurity expertise covering threat analysis, incident response, and security architecture design.

4+ Years
50+ Projects
Advanced Level
Threat Analysis Incident Response Security Architecture Risk Assessment
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🔍

Security Researcher

Expert

Deep dive security research, vulnerability discovery, and contributing to the cybersecurity community through responsible disclosure.

3+ Years
20+ CVEs
Expert Level
Vulnerability Research Zero-day Discovery Responsible Disclosure Security Publications
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🎨

Creative Designer

Proficient

Creative design skills for security presentations, infographics, and visual communication of complex security concepts.

3+ Years
100+ Designs
Proficient Level
Photoshop Illustrator UI/UX Design Infographics
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Want to see more skills?

Explore my complete skill set including programming, AI, video editing, and more specialized capabilities.

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✨ ⭐ 💫

🚀 Featured Security Projects

Real-world cybersecurity challenges I've tackled and solved

🎯

Enterprise Penetration Test

23 Critical

Fortune 500 company security assessment with privilege escalation chains and lateral movement discoveries.

OWASP Metasploit Burp Suite
3 months Solo $2M+ Protected
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🛡️

SIEM Implementation

85% Reduction

Deployed across 5,000+ endpoints with custom detection rules and automated incident response.

Splunk ELK Stack SOAR
4 months 5 members 15min Response
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🏠

IoT Security Research

8 Zero-days

DEF CON 2023 presentation on smart home device vulnerabilities and industry security standards.

IoT Firmware Reverse Engineering
8 months Solo 50+ Devices
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Ready to see more?

Explore my complete portfolio of security projects, case studies, and research findings.

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Certifications

CSS

Cyber Security Specialist

Comprehensive training in cybersecurity fundamentals, threat analysis, and security implementation strategies.

Professional Training Blue Team
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GD

Graphic Design (Photoshop & AI Tools)

Advanced proficiency in graphic design using Photoshop and modern AI-powered design tools for creative projects.

PSTU CSIT Design
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📝 Latest Security Articles

In-depth research, practical guides, and real-world case studies from the cybersecurity field

🔬

IoT Device Vulnerabilities: A Deep Dive

Research

Dec 2024 · IoT Security · 12 min read · 2.3k views

Comprehensive analysis of 50+ smart home devices revealing 8 zero-day vulnerabilities. Includes firmware reverse engineering techniques.

8 Zero-days 50+ Devices DEF CON 2023
IoT Firmware Reverse Engineering
Read Article →
🛡️

Building Bulletproof Web Apps

Tutorial

Nov 2024 · Web Security · 15 min read · 4.1k views

Step-by-step guide to implementing comprehensive security headers, CSP policies, and authentication mechanisms that actually work.

15 Headers 5 Frameworks 100% Coverage
CSP Headers OAuth
Read Guide →
🎯

Fortune 500 Penetration Test: Complete Breakdown

Case Study

Oct 2024 · Penetration Testing · 18 min read · 3.7k views

Detailed walkthrough of a 3-month enterprise penetration test that uncovered 23 critical vulnerabilities and led to a complete security overhaul.

23 Critical 3 Months $2M+ Protected
Penetration Testing Enterprise OWASP
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Want to read more?

Explore my complete collection of security research, tutorials, and case studies.

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About Me

  • 🏙️ Based in Pirojpur, Parisal, Bangladesh
  • 🟢 Open to Work
  • 📅 5+ Years Experience

I'm a cybersecurity specialist and ethical hacker who loves building secure, accessible digital experiences—and breaking things (responsibly) to make them stronger. I blend cybersecurity expertise with an attacker mindset to design, test, and deliver security solutions that are effective to use and difficult for attackers to abuse.

Recent work: penetration testing for Fortune 500 companies, vulnerability assessments, security research on IoT devices, building security guardrails, and mentoring teams on secure‑by‑default cybersecurity patterns.

0Experience (yrs)
0Projects
0Reports Fixed
TypeScriptNext.jsNode.jsDockerPostgreSQLBurpNmapOWASP
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  • Penetration Testing

    Web, mobile, and API testing with actionable remediation.

  • Secure Engineering

    Threat modeling, least‑privilege, and secure‑by‑default design.

  • Automation & Tooling

    CI checks, SAST/DAST pipelines, and custom scripts.

  • Security Culture

    Workshops, playbooks, and empathetic collaboration with teams.

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