adding features on my WordPress

I need a WordPress developer to add e-commerce functionality to my website using WooCommerce. The ideal candidate should have experience in developing e-commerce websites using WooCommerce and have knowledge of integrating payment gateways and shipping options. Additionally, I require a custom payment gateway to be integrated, which will be provided by me. The project requires attention to detail and must be completed within the given timeframe.
I want features that can help the customer choose the product he wants easily, as also I need to beautify the design and make categories appear for the customers.
(please stick to the budget given or don't bid)