There probably isn't any one "platform/framework" they used. This beast touches too many systems, many of which are 'legacy' for the phrase "platform/framework" to really apply.

If it's anything like what I saw at the one (and only) government contractor I ever worked for, the site is a frankensteinian nightmare of COTS ('Commercial Off The Shelf') crap (which federal contracts encourage, when they don't outright require it) and sweatshop-style integration development run by contractors who hire anybody with a heartbeat and a handful of competent people, and pay them all peanuts while billing $200/hr in labor to the government.

I'm sure tons. The web site's code is pretty straight forward, it's that interacting with so many other parties that is not (besides anything having to do with actual insurance, Healthcare.gov interacts with the IRS, social security, homeland security, Equifax, etc etc).

I'm not sure what the solution is since these checks are not optional. It would be a huge political scandal if just one illegal immigrant was able to buy insurance using Healthcare.gov and there are surely many groups trying every day to make sure this happens.

Is there any large benefits system that works well? All that I have seen from MegaCorps are also awful and they don't even have all the complex stuff to make sure you qualify (since you work at the company, you qualify).

mnsure.org was throwing springframework exceptions the day it launched

healthcare.gov itself was a Ruby Jekyll static site. It was on GitHub[0] for a while, but mysteriously disappeared. Here[1] is a clone of it, and what seems to be the currently agreed upon canonical version.

My state appears to be using Joomla based on the meta-generator tag in it's head tag. http://www.avenueh.com/

[0] https://github.com/CMSgov/HealthCare.gov-Open-Source-Release

[1] https://github.com/blencorp/HealthCare.gov-Open-Source-Relea...