I need a polished mobile application that runs smoothly on both iOS and Android and functions as an all-in-one NFC utility. Core actions must include reading, writing, and securely erasing NFC chips. Security sits at the heart of the build: every NFC interaction has to be gated by user authentication, the payload must be encrypted end-to-end, and granular access control should let me define who can perform each action. A clean, intuitive UI is essential, yet the underlying code should stay modular so future tag types or extra security layers can be added without a full rewrite. I will judge the project complete once: • A signed APK and TestFlight build let me read, write, and erase tags reliably on modern devices. • Authentication, encryption, and role-based access checks all trigger as expected during an NFC session. • Source code, build instructions, and brief technical documentation are handed over.