It is composed of the relatively small number of the high profile developers that occasionally pop up on HN. Most are blogs I found of less known developers which I bumped into when searching other stuff or when casually browsing Github/Twitter/StackOverflow. I try to add new feeds wherever I find them.
Would have shared RSS subscription list if was easily possible, however I use the newsboat [1] program and read the aggregate in the terminal. It's stored locally.