Magento developer needed ASAP to complete our extension

Hi there, We have 70% done of the extension describe below, so we are seeking for a DEVELOPER and not for a team. Requirement : 1. Zip code field should appear on create product page system in the admin and front end interface seller. 2. Zip code column should appear on product listing page at the back end to site admins. 3. Site admin can search the product from manage product page on the basis of product zip code. 4. On front end , also the product which has been uploaded manually created should be searchable on the basis of Zip code. 5. Zip code section should not appear on to the product detail page on front end to any one. 6. if I put zip code 10002 for example, I should be able to see the products in that zip code and a radius of 5, 15, 30 or 50 miles. 7. we need to add a section below category "Search by location" and a text box named "Search by location" where user can put the zip code and product under 50 miles will be searched there. 8. Also, user can select the range as per his/her requirement to search the product on the basis of zip code. 9. Use google maps for Geolocation. All the configuration of google maps and miles ranges it should be under configuration section. 10. The extension it shouldn't re-write any core file. Best bid and time frame will be answered. WE WON'T RELEASE MONEY TILL PROJECT AND COMPLETED AND TESTED. SO, PLEASE DON'T INSIST OR BID. Thanks in advance! Thanks