How can I make sure the freelancer who created my nft smart contract is not going to scam me?

I recently hired a blockchain developer on fiverr to create the smart contract for an nft project. The guy seems honest and seems to have no malicious intent. For my own peace of mind i want to make sure there isn't any backdoor or rug pull planted somewhere in the code but i do not know how to read it. Are there any specific functions or lines i should look out for?

before hired a developer from marketplace like fiverr, check seller level, i never suggest go with Level-1 seller. Also check their order history, coment etc.

Malicious coding can be check if you share your contract. There are not any specific words or line of codes.