NFT Minting Site with ERC-721 contract, with Collection Integration with OpenSea

Hello!

Looking for a developer to help us build our new NFT Collection landing / Mint site.

We need help developing a secure ERC-721 contract for the NFT tokens that will be minted in it. We also need an option for clients to Mint on demand on our website, and to be able to Whitelist Wallets.

ERC-721 contract must be able to integrate all items to our OpenSea collection using the Metadata we will provide.

Store tokenID URL Metadata in IPFS system.
Ability to connect Wallet on browser.
Join our Discord server link.
Description
Rarity Index
Roadmap
FAQs
Link to Twiter, Discord, Opensea
Tokenomics
Utility info

Blockchain Network: Ethereum
All baseline Solidity code must come from OpenZeppelin

Nice to have is set up a Dutch crowd initial sale on OpenSea for our collection for presale.

We will provide main graphics for website.

Sample sites:
https://thedogepoundnft.com/
https://mutantcats.io/
https://creaturetoadz.com/
https://fishbowlheads.com/
https://neandnationnft.com/
https://boredapeyachtclub.com/
https://doodles.app/
https://junglefreaks.io/
https://www.cyberkongz.com/
https://fishbowlheads.com/
https://www.billionaireclubnft.com/
https://shiboshis.shibaswap.com/#/
https://www.coolcatsnft.com/

Good baseline Contract sample OpenSea code
ttps://github.com/ProjectOpenSea/opensea-creatures

Test deploy contract on Ethereum Testnet, and link to OpenSea testnet https://testnets.opensea.io/ to make sure contract code is working before deploying to Live net.

Go live of the contracts will be done via Webex session to one of our Dev boxes. We will enter all private keys of _owner address and will not be disclosed to developer.

NDA required.

Thanks!