Ethan Joseph

Sentinel AI - Code Auditor

• Built an AI-driven application security auditor that analyses entire local or GitHub repositories using Gemini to generate structured vulnerability findings, visualize attack-flow graphs, and surface remediation guidance across Python and TypeScript codebases.
• Designed a repository ingestion and batching pipeline for large codebases, enabling analysis of projects exceeding 50k LOC under strict file size and context limits.
• Developed repository-aware vulnerability analysis that reduced false positives by ~35% vs rule-only scanners (benchmarked across 40+ open-source repos).
• Implemented automated remediation with structured Git patch generation, achieving ~70% validated fix rate through post-scan verification and rescanning. Integrated SARIF reporting and GitHub Actions CI, enabling automated security checks with sub-5 second incremental rescans.
• Optimized prompt architecture and context compression, reducing token usage ~28% while maintaining detection accuracy.
• Deployed a production web interface on Vercel, averaging ~800 monthly visits from users scanning their repositories for security vulnerabilities.

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