Long-Term developer (flexible with budget, Vietnam preferably)

im looking to hire someone from Vietnam or any country of my choice to be available on as needed basis for development projects in my company. Wether it be js or html development for my web site or my flutter mobile apps... (Budget: $10 - $100 USD, Jobs: Dart, DevOps, Docker, Flutter, Full Stack Development, HTML5, JavaScript, Nginx, PHP Slim, Web Development)