Hiring a Haskell developer can be beneficial due to the language's strong static typing and mathematical approach, which promotes efficient, error-free coding. Haskell's high-level functionality encourages clear, concise code, enabling complex tasks to be executed with fewer lines. This results in easy-to-maintain and robust software. Furthermore, Haskell's lazy evaluation feature can optimize performance by only computing necessary values, saving computational resources. Lastly, Haskell developers tend to be analytical, detail-oriented, and innovative, offering a unique perspective on problem-solving.