Assistance in building the store, various repair work. Acquaintance with: Laravel, JQuery

Hello, I need a programmer for permanent cooperation. A helper who will repair or write code that I couldn't write myself.

I'm working on the shop, it's based on Laravel, I need someone to fix some things for me:

1. Callback for DotPay payments or possibly rewritten code to be more secure;

2. PayU integration;

(If these payments could be integrated with the OmniPay package, it would be great)

3. Fix price summation when choosing product value.

4. Adding filters, such as: There is a list of products, the user selects, for example, GTX 960 Graphics Card => the system loads all products with such a filter.

This is an up-to-date list, with the passage of time there will be more work, so the price and experience are important to me. :)