Hiring a Functional Programming developer can enhance software quality and productivity. They focus on pure functions, avoiding shared state or mutable data, which leads to fewer bugs and easier debugging. The declarative and expressive style of functional programming allows clear, concise code. Functional programming also supports higher-level functions and lazy evaluation, enabling efficient execution. It's ideal for handling large data sets, parallel processing tasks, and complex systems, offering scalability and maintainability. This type of developer can bring a different perspective to problem-solving, often leading to innovative solutions.