I am a c/c++/objective-c Software Developer, mostly working on linux (Mac at home), developing software products which provide real-time connectivity to financial markets.
In my free time I'm trying to keep up with what's happening in objective-c/cocoa/uikit/iOS space.
In the past I have built desktop GUI in Qt, before switching to Mac. Apart from c/c++/objective-c I use python for anything else unless I find better suited tool (often plain bash scripts/make/vim/awk/sed/sqlite3 are very powerful).
In the past I have worked on various modules/stacks/features that shipped as part of an mobile operating system on phones worldwide for once a major US phone manufacturer.