The Yautjas (or more commonly known simply as Predators) are an extra-terrestrial race of warriors who hunt for sport and honor. Their hunts included humans and several species (judging from the trophy room in the picture below) and most prominently the Xenomorphs XX121 (or simply Xenomorphs).
In the movie Prometheus (2012) and Alien Covenant (2017), we see that the Engineers developed the crude version of Xenomorphs (to apparently send them to Earth and destroy all life on it) which was finally perfected by David (as per the movie Alien: Covenant as mentioned by the answer here).
So the question is, how did the Predators get the Xenomorphs? Did they steal the technology from the Engineers? Or were they advanced enough to create an actual species for hunting purposes and it coincidently is the exact same as the one created by the Engineers?