Modders are regularly hired by gaming companies, it’s a very good field to find passionate and talented people. I don’t have any specific examples of bug fixers hired by the studios, but the modder who fixed the very long loading times in GTAV was offered $10,000 by Rockstar, and Durante (who released the DSfix for Dark Souls: Prepare to Die Edition and GeDoSaTo, usable in a few other games) created his own PC port studio.
Modders are regularly hired by gaming companies, it’s a very good field to find passionate and talented people. I don’t have any specific examples of bug fixers hired by the studios, but the modder who fixed the very long loading times in GTAV was offered $10,000 by Rockstar, and Durante (who released the DSfix for Dark Souls: Prepare to Die Edition and GeDoSaTo, usable in a few other games) created his own PC port studio.