Thanks to the magic of computers, the market for most software or technological products isn't confined to their country of origin. A tech company can find clients flung all across the globe. However, this means that they need to provide global service levels to meet international demand levels, which is where a global service manager comes into play.
A global service manager coordinates support for users of a product. They often manage a whole team of staff dedicated to service. The global service manager helps improve service by maintaining databases, testing products, and fulfilling any project management duties. They basically cover whatever needs to be done to make sure that a product makes clients happy.
The global service manager needs to have some technological knowledge and experience working with people to crush this position. Many have bachelor's degrees or even master's degrees in business and years of experience in project management.