Amazon already offers same-day delivery in more than a dozen U.S. cities and in the U.K., but the company likely has even bigger plans. New job listings spotted by Reuters suggest the e-commerce giant is looking to bring lightning-fast shipping to the entire world, though it could be a while before that actually happens.

One job listing posted by the company in October is particularly revealing. "Our long-term vision is that customers can order and receive a sellers' product the same day anywhere in the world," it reads. A handful of other listings for positions in marketing and product departments reveal similar plans for the future.

Same day delivery should help bring in even more Amazon customers, but it could also cover shipping and expansion costs. The company currently charges Prime customers $5.99 per order for same day delivery, and $8.99 plus a per-item fee of 99 cents for everyone else. Amazon also plans to expand same-day delivery to third-party sellers using its site, potentially bringing in even more revenue.

Of course, Amazon may also need to expand same-day delivery just to stay competitive. Google already offers a similar service in some regions, while smaller startups like Postmates and Instacart promise to deliver local orders in under an hour.