Hiring a Closures developer can be a strategic move for your company if you're dealing with complex, large-scale systems. Closures, a feature of JavaScript, is used to handle asynchronous operations, making it crucial for web development. A Closures developer can help enhance your product's performance, manage states in a controlled manner, and maintain data privacy. Their expertise in handling functional programming concepts can improve code readability and maintainability. They can also help in creating data structures and managing variable scopes effectively, ultimately leading to a more robust, efficient, and secure software system.