Rafael Cavalcanti da Silva
Fullstack Developer & Security Specialist
Immersed in technology since age 10 and working professionally since 16. With 22+ years of career, I develop high-impact software. Founder of xpusher.net and wsocket.io. From projects for government, international orgs and industry to complex SaaS platforms, multi-language SDKs and vulnerability research — I deliver end-to-end solutions.
Blog
Breaking 9 layers of DexProtector: Real-world reverse engineering of an Android banking app
Advanced reverse engineering analysis of a mobile banking app protected by DexProtector with 9 layers: encrypted DEX, ~2000 enc!5016 strings, JNI dispatch with 148 overloads, dynamic RegisterNatives, TEA-like stream cipher, ARM64 emulation with Unicorn, memory-only .so dump, ALICE anti-fraud bypass — all documented with real code and results.
→SEO Case Study: From zero to Google's top — Part 1: Diagnosis, tech stack and first steps
Real-time series documenting the process of ranking 'Rafael Cavalcanti da Silva', 'rafael cavalcanti', 'rafael' and 'root' on Google — using Astro, Nginx, Google Analytics 4, Search Console and advanced technical SEO techniques.
→Real-world Linux Server Hardening: 14 layers I apply in production with automation code
Advanced Linux hardening guide based on real infrastructure: SSH hardening + fail2ban + UFW + kernel sysctl + auditd + systemd sandboxing + nginx auto-fix + Redis bind + MongoDB auth + Postfix secure relay + automated backup with Google Drive + orchestrated restore via Go + Conky monitoring — all with production scripts and configs.
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