Beyond technical proficiency in Unity, it's crucial to seek developers with strong problem-solving abilities, adaptability to new technologies, and excellent communication skills. A well-rounded Unity developer will also have experience in both 2D and 3D game development, scripting, and familiarity with various game genres. Their portfolio should reflect a range of projects, showcasing their versatility and depth of knowledge. Additionally, soft skills like teamwork, time management, and a passion for continuous learning can set apart a good developer from a great one.