There are a few reasons why you might want to hire a Grand Central Dispatch developer: - They can help improve the performance of your code by making sure that tasks are executed in the most efficient way possible. - They can help make your code more responsive by ensuring that UI updates are made in a timely manner. - They can help reduce the amount of work that needs to be done in order to maintain your codebase, since they will be familiar with the tools and APIs that are available.