If you want to understand what went wrong on healthcare.gov and how it was fixed, Mikey Dickerson's talk here is the closest thing we have to a postmortem:
https://www.youtube.com/watch?v=0albm_hhQzM
healthcare.gov has also given rise to new initiatives to fix the way the government writes software. Within the government, there is the US Digital Service, 18F, and the Presidential Innovation Fellows: https://medium.com/@USDigitalService/an-improbable-public-interest-start-up-6f9a54712411
18f.gsa.gov
http://www.jasonshen.com/2015/when-did-you-do-your-tour-of-duty/
http://www.jasonshen.com/2014/everything-wanted-know-presidential-innovation-fellowship-afraid-ask/
There are also new types of government contractors, including Nava and Ad Hoc LLC: http://www.fastcodesign.com/welcome.html?destination=http://www.fastcodesign.com/3047856/innovation-by-design/meet-nava-a-startup-that-wants-to-fix-the-governments-crappy-design
http://adhocteam.us/