Oussama H.

Full-Stack | Cybersecurity | Blockchain Engineer

I’m a Full-Stack Engineer specializing in Cybersecurity, Blockchain, and AI-driven systems, with 6+ years of experience building secure and scalable applications. I work across the full stack, from backend architecture to frontend integration, while ensuring that security is never an afterthought. - Cybersecurity Secure system design & vulnerability assessment Web/API security (OWASP best practices) Cryptography & attack prevention (including replay-attack protection systems) Smart contract security analysis - Blockchain Development Smart contracts (Solidity / Rust / Ethereum & Solana) Token development (ERC-20, BEP-20, custom logic) DeFi systems (staking, trading, liquidity mechanisms) Contract optimization & gas efficiency - Full-Stack Development Backend: Node.js, Python (Flask, APIs) Frontend: React, Angular Database design & system architecture REST APIs & scalable services - AI & Automation AI chatbots (RAG-based systems) Intelligent automation tools Data-driven applications