Creating a Java Script / Google script for Google Spreadsheet

We are based in Barcelona, Spain, we'd be happy to find a local Freelancer but we're open. We speak Spanish fluently. We have set up an email parsing through [login to view URL] of emails from various market places. Then, through, Zapier, we send the data in a Google Spreadsheet. We want to have a google spreadsheet Script (Google Script, more details at [login to view URL]) to process correctly the data. Basically, we want to find matching entries from different sheets of the same worksheet. Let's say that an email from one marketplace wants to buy a specific model of equipment, we want to spot any other email where someone wants to sell. The emails are quite standard and that's why we manage fairly well to use a mail parser to send them to Google Spreadsheet. Basically the Java Script (Google Script) is to create user-friendly match and find features, on several criteria. More details once you contact us. Thanks