It will be unfair to reach any figure without knowing your exact requirements because the cost of an android app development or tasks related to your existing apps can vary according to development complexities, technology stack & timelines you wish to dedicate to the project.
We request you kindly opt for the free consultation by our mobile app development experts for a precise cost estimate to hire android developer for your project. They will analyze your project to determine the complexities & resources required to get it done.