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Simple if you want to develop a chat app in android then you should give it to an android developer :D.
Just Kidding...
If you want to outsource your chat app development then you basically have2 options with each possessing its own pros & cons.
1. Hire an in-house team of freelance developers
Finding a team of freelancers may not be tough but the difficult part is to manage those resources in-house. Management is the toughest part even though it doesn’t feel like one before starting the work.
Along with human resources, the setup needed for the development would be an extra headache for an entrepreneur.
2. Hire a professional development agency
Choosing this option might cost you a little more than hiring a freelancer but believe me it does take small headaches away from your head and lets you focus on the important problems for getting your startup going.
Also, the development agency's geographical location plays an important role in the cost of development, so I would suggest choosing the agency from a developing country like India where you could get the required skills and talent in a developer as well as it helps in managing the overall development cost.
For more information regarding the development, I would like to share with you an article from a Web & Mobile App Development agency from India.
https://qphs.fs.quoracdn.net/main-qimg-60c0b1f51a65a3bb0bd37699b1e05e41
