There are some neat front end libraries like Leaflet and Cesium. The back end is quite varied since I often work with clients that have very custom and specific

There are some neat front end libraries like Leaflet and Cesium. The back end is quite varied since I often work with clients that have very custom and specific work they want done, sometimes on their own network isolated from the net. I actually try to keep things as plain and boring as possible. Postgres for (structured) data storage, and Go has been great to create server that supplied the backend API. In many cases we don't have to worry about massive scale, but rather limited hardware. It's actually really amazing when you're limited to writing a lot of things by hand. Things can become extraordinarily compact and efficient.