Groove VR: Has several positions including a technical artist and a Houdini artist https://www.groovejones.com/workwithus/
SurviVR: currently has a contract position for a 3D Animator https://survivr.com/careers/

Twisted Pixel Games (primarily VR games). Several positions, including Level Designer, Character Modeler and Gameplay Programmer. https://twistedpixelgames.com/careers/

HookBang: Looking for programmers and an environment artist. https://hookbang.com/careers/

Austin Visuals: Animation jobs- 3D Animation Producer, 3D Character Rigger, and 2D Animator. https://austinvisuals.com/animation-and-marketing-jobs-in-austin/

Praxent: Software Engineer positions and a UI/UX Designer https://praxent.com/careers