I've been involved with Bitcoin programming since May 2011. I have contributed to several open source projects including cgminer and Electrum. I started GPU mining early on and extended my skills to include the technical and programming knowledge necessary to build Bitcoin web apps and utilities. I designed, prototyped, and debugged an open source ASIC mining board including low level firmware and drivers that required deep knowledge of crypto routines, blockchain structures and interfacing to mining pools for successful error-free operation. I have knowledge of Android Java development and building Bitcoin related apps.