I'm not qualified to judge who is or isn't "the best of the best", but I suspect there is a lot of difference between mission-control software for human-rated (crewed) space vehicles vs robotic vehicles. The former demands enormous effort to develop.
A readable article on the group that developed the Space Shuttle's software is "They Write the Right Stuff" by Charles Fishman [1]. It has some interesting insights into the group's development culture, as well as the type of people who do that job (tldr: they're not ninja rockstar js hackers).
A readable article on the group that developed the Space Shuttle's software is "They Write the Right Stuff" by Charles Fishman [1]. It has some interesting insights into the group's development culture, as well as the type of people who do that job (tldr: they're not ninja rockstar js hackers).
[1] http://www.fastcompany.com/28121/they-write-right-stuff