Software Engineer · Payment Solutions · Android POS · Ethical Hacker 🎩
_{Mexico 🇲🇽 · In tech since age 17 · Building end-to-end transactional systems}

• End-to-end payments — Android apps for POS terminals, ISO 8583 transaction switching, TMS and ECR.
• POS terminals — building on Verifone, PAX, Newland, Landi, MoreFun and Ingenico; wrapping vendor SDKs behind clean, testable interfaces.
• EMV & card schemes — EMV / TLV processing, transaction cryptography and work with the major card networks (Visa, Mastercard).
• Key management — secure key ceremonies, injection and lifecycle (DUKPT, master/session keys), HSM integration and key-management services for payment devices.
• Digital onboarding & KYC — merchant enrollment flows, identity verification and document-capture pipelines.
• Biometrics — facial recognition and fingerprint authentication for identity verification and secure access.
• Ethical hacking (white hat) — reverse engineering of APK/AAR/DLL/.so, binary and protocol analysis, and writing exploits just for the fun of it. Offensive research feeding defensive builds: obfuscation, encryption and Android app protection (RASP).
• Remote device control — TMS and remote-management agents for POS terminals: fleet deployment, monitoring and operation at a distance.
• Applied LLM & AI — automation, agents and custom tooling powered by large language models.
• Transactional backends — switching and clearing with Java 21 + Spring Boot, pure domain logic and high reliability.
• Architecture — microservices, SDK design and payment middlewares that abstract vendor hardware behind stable, reusable APIs.
• Linux & Cloud — Linux server administration, Docker containers and self-hosted infrastructure.
• Full-stack — admin dashboards with React + TypeScript + Vite and APIs in Node / Spring.

Open-source first, self-hosted by conviction: I don't like paying for licenses — for anything. If it can be built, self-hosted or released, I build it.

DexShield — open-source Android code-protection framework: AES-256 encryption, obfuscation and RASP (anti-debug / anti-tampering). Kotlin + C++/JNI. A free alternative to commercial solutions.

Kotlin · Jetpack Compose · Java 21 · Spring Boot · C / C++ (JNI/NDK) · .NET / C# · React · TypeScript · Node.js · Linux · Docker · Microservices · SDK Design · Middleware · ISO 8583 · EMV / TLV · Ethical Hacking · Reverse Engineering · HSM · Key Management · Biometrics · KYC · LLM