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Note: My skills can be categorised in three levels as follows.
*** is from upper-intermediate to advanced
** is intermediate
* is basic
However, this classification is based on my confidence and experiences relevant to the skills, but not using any evaluation scale.

Programming
***. C/C++, Java, Python
**. Shell script
*. Assembly

Operating System
***. Linux, Contiki
**. Android
*. Windows

Network and Communication
***. LAN, WAN, WSN
**. BLE, Telecom (2G,3G,4G)
*. NFC

Tools
***. Protégé, GIT, Latex, Wireshark, COOJA, DrawIO
**. GDB, VMWARE, Google office (docs, spreedsheet, presentation)

Language
***. Vietnamese, English
**. French