Hi,
I can definitely add locator functionality to your google maps, For example, on entering a query in maps search it will pin the specific vendors in that radius, If you want to add pins to vendors without any query then we will set a static radius, I am very comfortable and sure about the requirement I will implement this using JS, HTML, PHP, and MySQL.
Though I would like to work hourly. After completing the task I will also perform Regression Testing to check our update haven't affected any other functionality.
You will find the WOW factor in my work and For sure we will have a long term business relationship as well.
Best,
MK