Senior Full-Stack & Backend Developer | 9+ Years of Experience | Fintech, Payments & Scalable Platforms
I'm a software engineer focused on building secure, scalable, and high-performance applications. My strongest areas are Node.js, PHP (Laravel), JavaScript/TypeScript, and modern front-end frameworks. I've led and built platforms that process thousands in transactions, developed custom EMV SDKs for Android POS devices, and implemented solutions that follow strict compliance standards.
- 🔭 Currently working on advanced Node.js & NestJS microservices
- 💬 Ask me about fintech, payment systems, EMV integrations, microservices, API security, and scalable architectures
- 📫 Reach me at: anthonylj.cr250@gmail.com
- 🚀 9+ years building startups, fintech, and high-load systems
Database & Cache
EMV SDK Development - Built custom Android SDKs for EMV card payment processing and POS device integration
I've also built platforms using Java with Spring Boot and Python with Flask, gaining practical experience with these ecosystems.
- ✅ 9+ years of real-world experience in startups, fintech, and high-load systems
- 🔒 Strong focus on security, reliability, and clean architecture
- 👥 Experience leading teams and designing core systems from scratch
- 💡 Passion for helping businesses build scalable, future-proof platforms
- 🌎 Bilingual: Spanish (Native) & English (Professional)
