With my 5 years of expertise in web technologies, I assure you that I have the skills to deliver what you're looking for with your React Native app project. Not only can I integrate a single chat API to your backend (which I have done countless times before), but I can also ensure the app is smooth, responsive and easy to use - making it ideal for sharing with friends.
Additionally, given my full-stack developer background, I am highly experienced in deploying apps to platforms like the Playstore - this way, after our cooperation, your app will be ready to reach a wider audience. Although you mention budget constraints, rest assured that I'm genuinely excited about your project and will work within your financial limits while guaranteeing an excellent quality product.
If awarded this opportunity, not only will you benefit from the services of a highly skilled developer, but also from someone who truly understands the importance of customer satisfaction. Don't let budget limitations discourage you; let's create something great together!