Build an android application and a website

I am looking for a skilled developer to build an e-commerce android application and website. The application and website will be used primarily from local businesses to promote discounted products online, and from potential buyers. I am looking for a custom solution that is tailored to my specific needs. The ideal candidate should have experience in building custom e-commerce platforms and integrating PayPal and not only, payment gateway. The website and application should have an easy-to-use interface, be mobile responsive, and have features such as inventory management, order tracking, and customer support. The project should be completed within a reasonable timeframe and within budget.