Where Golang Fits
Go makes an ideal choice for backend web development, particularly for high-performing concurrent services on the server side. It can be used for building the server side of your mobile app too. For instance, the GUI part of an Android app can be written in Java while the app backend can use Golang.
Where speed and scalability are needed, Go is often opted. It is the perfect language for writing microservices. Go also features as an option among Python and R in data science because of reasons including easy deployability, cross-platform support, and built-in error checks.