Mobile app tester required

We need a mobile app tester for an Ola-like app and admin panel under development. The tester should be good at English as he/she will have to point out grammatical mistakes in the app and admin panel content as well. I want to hire someone on a monthly basis for which I have a budget of INR 5000 per month. Each time the developer shares an update, he/she will have to test it and update the bugs in Trello. He will also have to communicate and coordinate with the developer whenever required. Here my expectation will be that once an update is shared, the testing needs to be completed as soon as possible.