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Re:Mondo – A “Full Stack” Mobile-First Bank by shassinger on Monday June 01, 2015 @10:54AM (#9638990)
I'd love to see an OSI-style diagram of the banking stack
Re:Mondo – A “Full Stack” Mobile-First Bank by tomblomfield on Monday June 01, 2015 @11:11AM (#9639174)
Jack Gavigan took a shot at a high-level picture a year or two ago - http://jackgavigan.com/2014/04/14/disruptive-bank/

And Microsoft publish a "reference architecture" - http://download.microsoft.com/download/C/5/F/C5FCCA52-1056-4...