"Architects" was the nickname given to an unknown mysterious race or races that, at some point in time, inhabited the galaxy and may have interfered with celestial astrography, the culture and technology of early sentient species.
The Architects were suspected of being a race millions of years old and from a different galaxy, like the Yuuzhan Vong. It has been proven, somewhere along the line, that the Architects interbred with the evolving Roninosions and a gene in the Architects meant that they could not easily feel the Force, but when they could, they were exceptionally powerful Force users.