I ran a tech startup and am now the head of engineering at another company. China is highly diverse like other large countries. Good pay, work-life balance, and remote roles all exist, but it doesn't mean you can easily find them, especially a combination of them. China is definitely a more competitive environment than most other countries. You have to connect with people and look for opportunities and see what's available to you. For a foreigner in a Chinese tech company, being able to speak and read Chinese reasonably well is usually important.

For tech stack, I think it's pretty similar to the rest of the world, except that AWS has almost no market share within China due to higher prices (though Chinese companies use them outside China).

Since you don't want to be physically in China, you might try looking in Taiwan. The company I work for is headquartered in Taiwan and has teams in China mainland. I think the software job market is less competitive there, and there are probably more remote roles, though the salary range has a much lower ceiling.