We have mobile application for Android/iOS. It has backend hosted on Amazon Web Services by means of AWS API gateway, with data stored in Amazon RDS MariaDB and in Amazon Elastic Cache redis.
Backend consists of 5+ various Golang or Nodejs powered applications that use the shared authorization and data from MariaDB and Redis. Microservice provides ~5 REST API endpoints. Microservice code is executed either on EC2 machine or Elastic Beanstalk.
Stack is for nodejs - expressjs, sequelize.
Stack for Go - gin-gonic/gin, jinzhu/gorm.
We need developer with strong skills in nodejs, golang, and some skills in frontend frameworks (angular 1, knockoutjs) for building admin panel (twitter bootstrap 3 without customization) - ideally 1 person, we can pay extra if person has skills.
We need to create 2-3 microservices, and 1 nodejs powered microservice with socket.io.
Also make some small fixes and improvements in current microservices
So i think it will take less than 1 month of work.
For communication we use Telegram messenger with groups and channels, so using it is required.
Also bitbucket account is required, alongside with Git experience.