Hiring a HLSL (High-Level Shader Language) developer is crucial if you're working on video game development or animation. They have deep understanding of graphics rendering, creating realistic and immersive visuals. With their expertise in DirectX and OpenGL, they can optimize graphic performance, ensuring smooth and engaging user experience. They can also create complex shader programs for advanced effects, such as lighting, shadows, and textures. Their skills can greatly enhance the visual appeal and performance of your gaming or animation project, making it more competitive in the market.