Hi, We are hiring individual freelancers to bid on this project. In terms of technical skillset one should have good experience in Ruby on rails as thats where you will be working
As Senior backend developer you will be involved in API integration and building microservices for it. You should have minimum of 4yrs of experience in working with Ruby, Rspec. You will be involved in working with writing APIs in Ruby and Rspecs.
Note: Company DONT bid on this project as we are hiring individual freelancer.