I got a great (rather luxurious) apartment for 13,000 bath/month on a year lease in Bangkok before prices went up again after covid restrictions relaxed

That’s around $400/month

Look up near Saphan Kwai and Lat prao. Near parks and cheaper

I’m a dev too making around $7,500 to a bit over $8,000 USD a month generally. Freelancer but steady clients and haven’t taken a new project in a year and a half. Living in Asia for over 4 years now