First things what I'd like to say is that I work only on projects where you can provide me access to your resourses. For working "on blind", theory, suggestion or any other form of work where I can't see results... simply forget it, I won't work with you. Teamviewer is too slow for working, so only in some cases I'll accept to work on that way.
Languages, envirements and projects
C - POS terminals, Linux shared libraries, Cryptography, Protocols;
Java - Cryptography, Protocols, JDBC, Ibatis;
C# - Amazon MWS;
Oracle PL/SQL developer;
PostgreSQL + migration of projects from Oracle to PostgreSQL;
Python - by need for scripts and help tools.
Experience in payment industry.
Capable to organize your data into database.