Currently my work is related to NFC, me and my team are a building a system using NFC technology in a smartphone and smartcard(mainly feliCa card), the system are used to make transaction possible using such item.

My job was to make a dynamic library/dll that is used to access a SAM(Secure Access Module) which connected to a SAM reader. SAM is a SIM-like hardware that is used to authenticate a smartcard used in a transaction, the language used to make the dll is C++.
And the program that use the dll is a java servlet program, to access C command from java, i'm using JNI(java native interface).