Go is a relatively new language in the scene, and many of the struggles to find developers skilled in it stem from this fact:
There aren’t many developers proficient in the language: Go was released to the public in 2009, and hasn’t had much time to entrench itself in the skillsets of many developers, since other languages would usually take precedence due to job market demands. This is slowly changing, but the number is still low, making developers harder to find.
There aren’t a lot of places to find them: Due to the shortage of Go developers in general, not every job board or other online recruitment site will have access to Go developers. People looking to recruit them will have to pick the sites with the most reputable, where G developers, tend to congregate.
They can be costly: Due to their scarcity, Go developers tend to be in high demand, making them valuable assets. As such, it is very difficult to find Go developers at reasonable prices, since top companies tend to snatch them before the competition.