Finish a NFT marketplace

We are creating a NFT Marketplace like OpenSea. Our coder worked on the project for 6 months and almost finished it but was called up to national service in Turkey. We need the project, finished, deployed, and uploaded to our servers. The team must be familiar with both coding and blockchain. I believe it was made on using Java Script but am not 100%. You must speak fluent English and be able to guide me on the correct way to finish the project as I have very little knowledge around coding.