Google map related micro service devalopment

Objectives: as part of bigger project, we need a Private RESTfull API as per OpenAPI 3.0 specs (we'll provide the template) This API is a wrapper over Google MAPS API, and Firestore Database. Firebase authentication to be used. There are three 'GET' functions: 1- Get Filtered List: based on shopper's location, and search radius. inputs: search radius (kms) and location (lat, long) output: _a list of shop Ids search pool: a list of shops, not every shop in google maps. 2- Get estimated delivery time: input: Shop Location (id) , User location (lat, long), epoch time for delivery start time(number) output: object {distance (km): number, time: number} 3-Get list of locations: input: same as get Filtered List output: sorted by time, detailed and paginated list of objects {shop id, calculated distance, estimated driving time} to each shop in the filtered list shop locations (search pool) are stored in Firestore Database, read-only for the API service account. {shopId: string, lat: number, lon: number}[ ] Task Output: updated API contract / specs (if changed) API code in Node.JS (ready to be hosted as Google Firebase Cloud Function, with security setup (private api). Skills required: intermediate experience or more as backend programmer, API, NodeJS, Google Maps API, Google Firebase Preferred Technology to be used. - Node.JS - Google Maps Api, - Google Firestore Database, - Google Firebase Cloud Function. Graphql can be used.