VR industry has taken off relevantly recently - it's been especially rolling out in the last two or three years. For this and many other reasons, it still remains quite a challenge to hire a professional VR animation company with solid knowledge and experience.
Another obstacle is scarcity of talents on the market. As a rule, VR animators come from the game industry, as this domain has witnessed the rise of the technology the most. However, their number is limited, while the technology keeps on becoming more demanding.
When hiring a VR animation creator, have a close look at their portfolio: how verse are they with 3D design, animation techniques and game development in general? Projects and timeframe of working on it are important here.
Ask candidates to tell more about work experience, what technologies they used and what solutions they came up with when facing issues. The best answer for tools would be Unity 3D, Unreal Engine, 3DS Max & Maya, Quixel and GearVR Framework and preferred languages - C++, C# or similar ones.
One more hint: see if VR designer's experience is relevant to your business vertical. You will need a passionate animation designer that keeps up both with business and technology updates.