Need Urgent help developing Solidity smart contract, ERC-1155 is target

Hello, I'm a developer myself, and I have 75% of work done, but ran into a few questions.

I would like to talk directly to developer, not project manager. I have code working that partially works, so I want to collaborate with dev.

Here are the goals:
1. Create ERC-1155 contract, that is upgradable.
2. It will be deployed on Matic Network (but should be similar and work on Eth net too)
3. Now I can mint one NFT, but I want to mint/create "N" # of NFTs. Probably this means we have a JSON config for our project, and then scan a directory and mint an NFT for each file in the directory.
4. Integrate with OpenSea. I know this already but may need a little help.
5. Test end-to-end on Testnet, including opensea.

Thanks thanks for your proposals. I will answer soon if you meet the qualifications.

Here are 2 starter templates we are considering using:
https://github.com/ProjectOpenSea/opensea-erc1155
https://github.com/0xsequence/erc-1155

Also, attached is current contract I have working but this one is ERC-721

Again we have urgent need, so we hope developer is available soon.