I'll provide a counter point to this.
First of all, you don't require portions of the Healthcare.gov software to be written in Belarus to be compromised. Frankly, I don't buy this.
Second, CGI Federal, while being based in Canada and proven to being a fairly incompetent company on a number of occasions would not have any reason what so ever to have a need for Russian programmers. That would be more incompetent then I can attribute to them.
They don't even need it, the website was written so badly I think bad actors could inject code without even being associated with the project.
Think about it, they wrote it and stood it up after which it failed so badly that they were forced to begin swapping out entire blocks of code only to put that into production within hours.
Now when you understand that the site has never once, even to this day, been subjected to a true end to end security eval and having to frantically swap out code.
You don't even need a Russian component to the construction of this website, all they would have to do is sit back and take notice that it was melting down. Even without that it is destined to be challenged just because of the prize.