I think Reddit is good. My short personal background:
I’m a full-stack software engineer with experience working in companies (8 years), experience working in YC startup, and founding my startups. At the moment I’m running an existing PropTech construction management software startup.
I had to leave favorite job two times. It’s hard. It feels like you are traitor. But it’s something you have to do and if current colleges and bosses are kind - it’s going to be smooth and you gonna still be able to communicate and support each other.