Fix and refine the functionality of the website on Wordpress

You need to fix and refine the functionality of the website on Wordpress (php, ajax, js, mysql) This requires a PHP specialist and web programming. The level of tasks is average and above average. The payment is good. Interested in long-term cooperation.
Level of training - Senior Developer, experience 8-10 years.
Please respond with a description of your training, experience, and rates.
I will provide the address of the site and details of the tasks to candidates with the appropriate skills on demand.