Youssef Ahmed AbdelfatahYoussefAhmed
ENGINEERING SECURE SYSTEMS.
Short Bio
I'm Youssef Ahmed, a Computer Science and Engineering student at GUC dedicated to building secure, high-performance applications. By blending rigorous software architecture with offensive and defensive cybersecurity principles, I engineer resilient solutions that prioritize both efficiency and defense.
Specialty
Architecting scalable backend systems and secure web applications with a structure-first mindset. While syntax can be learned overnight, my real strength lies in understanding software architecture, system design, and security fundamentals. I focus on database design, secure API structures, and web application security ensuring every system is built on a resilient, rock-solid foundation.
Goals & Interests
My ultimate goal is to build software and web applications that are secure from day one. I am driven by the challenge of designing high-performance systems where security is baked into the architecture rather than added as an afterthought. I continuously expand my expertise in systems security, vulnerability research, and complex software engineering.
Top Projects
GUC Swap
Full-stack group and tutorial swapping platform built specifically for German University in Cairo (GUC) students, featuring a graph-based multi-way cycle detection engine, immutable identity-bound permanent ban enforcement, device-bound session security, Transport Payload Obfuscation, and a 3-tier email failover chain.
AI Detector
Trained a custom Logistic Regression classifier from scratch on ~300k samples with 29 handcrafted NLP features to detect AI-generated text zero ML framework dependencies at inference.
DefendX
A self-hosted WAF + SIEM + IDS with 32 threat detectors, escalating auto-bans, and a real-time security dashboard built in TypeScript with Hono, Drizzle ORM, PostgreSQL, and React.
Shrinko
A URL shortener running on Cloudflare Workers - custom salted-account auth alongside Google OAuth, hashed-at-rest session and monitor-key secrets, per-query ownership enforcement, privacy-preserving click analytics, and layered edge hardening. Plus edge-rendered QR codes and anonymous monitor-key link management.
Technical Stack
Core & Architecture
Building scalable, maintainable software systems.
DevOps, Systems & AI & Tools
Automating deployments and managing production environments.
Backend & Databases
Developing secure APIs and high-performance services.
Security & Research
Identifying vulnerabilities and applying secure coding practices.
Experience & Education
Bug Hunter
HackerOne
HackerOne
Independent security researcher conducting authorized penetration testing on public bug bounty programs via HackerOne. Focused on web application, API, authentication, authorization, and backend security.
Systems & Software Development
Independent Projects
Independent Projects
Designing and architecting custom full-stack applications and backend microservices. Focused on algorithm optimization, secure API integration, and relational database structures.
B.Sc. in Computer Science and Engineering
German University in Cairo (GUC)
German University in Cairo (GUC)
Intensive focus on computer systems architecture, complex algorithms, software engineering principles, and discrete mathematics.
Achievements & Certifications
Ethical Hacker
Cisco Ethical Hacker badge completed 34 hands-on labs across vulnerability assessment, network/web exploitation, and remediation using Kali Linux.
View CertificateMachine Learning Specialization
A comprehensive 3-course specialization covering supervised/unsupervised learning, neural networks, decision trees, recommender systems, and reinforcement learning.
View CertificateCryptography I
Mastered core cryptographic principles including symmetric & asymmetric encryption, hash functions, digital signatures, and key exchange. Gained practical experience in cryptographic security models, attack mitigation, and building secure applications.
View Certificate