Flutter + Firebase + Rest API

We need a well - experienced Flutter Developer for integrating Rest API with the partially developed backend. Basically we need to develop a product using Whatsapp API. We have the rest API ready and the partially developed in Vue.js. We need to make a product that uses Whatsapp API to get messages and provide an organised dashboard and also store that messages in Firebase. We have long term prospects for this project. So while bidding please consider that you should have good experience in the said task.