In short, everything. Language barriers and lack of proximity lead to breakdowns in communication and quality. Do yourself a favor and stay local.
On a related note, if you’re thinking about hiring for the position internally, think about this: it takes around three people to complete a successful custom software project. If you hire someone internally, their salary might cost what it would take to build with us, and you get a whole team when you work with us. Plus, if your software developer decides to leave, they take their knowledge with them. If one of our team members leave, our whole team shares the knowledge so you’re not left in the dark.