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You want a noncompete and nondisclosure agreement as well as a contract that says anything they develop with your funds is owned solely by your company. The challenge is that if there is a breach, you would need to file suit in Pakistan in order to enforce it where lawsuits are lengthy and ineffective. There are plenty of templates you can find online and just revise those to say that the governing law is in Pakistan.
It may be beneficial for us to talk via telephone to figure out how best to address these issues. There are additional charges.