Brennan Yagi

Data extraction. API reverse engineering. Technical reconnaissance.

Selected Work

Enterprise WAF Defeat

Global marketplace platform with multi-layer bot protection. Mapped an internal API powering the frontend, documented the token lifecycle, and built a long-lived access method that eliminated the need for continuous browser automation.

Anti-Analysis Evasion

Popular platform with anti-debugging protections and credentials stored exclusively in runtime memory. Developed extraction techniques that avoid triggering detection, reverse-engineered a real-time session protocol, and built a self-updating system that tracks platform deployments.

Split Architecture Discovery

High-traffic consumer review platform with aggressive bot detection on the frontend. Discovered a fully open data API on separate infrastructure with no authentication, no rate limiting, and comprehensive coverage across all content categories.

TLS Fingerprint Bypass

Major employment platform rejecting non-browser clients at the connection level. Bypassed fingerprinting and discovered structured data embedded directly in page responses, eliminating the need for separate API calls.

Backend API Discovery

Bot-protected media aggregation platform. Found a fully open REST API on separate infrastructure serving richer data than the frontend displays. 200K+ entries, 30+ endpoints, zero authentication required.