Rafael David Castro Luna

I am a Senior Mobile Software Engineer with nearly 20 years of experience building high-quality native applications for Android and iOS.

My expertise includes Android (Kotlin/Java), iOS (Swift), backend development with Java and Spring Boot, and designing scalable mobile architectures. Throughout my career, I have delivered applications across fintech, payment systems, education, transportation, and enterprise sectors.

I have extensive experience integrating NFC, Bluetooth, payment terminals (POS), REST APIs, Firebase, local databases, and secure authentication systems. I enjoy solving complex technical challenges while keeping the user experience simple, reliable, and intuitive.

I have worked on projects from initial architecture and development to deployment on Google Play and the App Store, collaborating with multidisciplinary teams and stakeholders to deliver robust, maintainable solutions.

I value clean code, software quality, and long-term maintainability. Whether working independently or as part of a distributed team, I focus on delivering reliable products on time while maintaining high engineering standards.

I am currently available for remote freelance opportunities and long-term collaborations with companies looking for an experienced mobile developer who can contribute from day one.