yea just try a few until you get 2 or 3 that always deliver.

you can try some sort of screening process; have them give code examples, answer 10 questions in chat (that arent really on google, it gets tricky when the answers are on google); or screenshare and have them show u some of their code and explain a few lines what it does...

pakistan is not the greatest country to outsource from, you will have better luck with south american countries and asian countries