I am an experienced android developer. I have developed somany apps sofar for top Indian telecom companies like Bharti Airtel, Reliance. I have developed apps in freelancer.com.
Before the employer award me the job, I will give him/her a prototype of his requirement for free. If he likes the prototype, then he could award. I will give a free prototype. Based on the requirement, I take 12-24 hours to develop the prototype.