Full Time DEV to work on Extranet / PHP site and Mailchimp.

Description

Looking for a full-time or a minimum of 20 hours a week to work on a PHP Extenet website.
Working on tasks on Basecamp, to make changes to the back end of a CMS site.
https://www.butlerswithbums.com/instant-quote/ - This is the front-end website that is fed into my extranet and templates are sent via MailChimp or Cron on the extranet.
We will work closely with another excellent developer who overseas the tasks you complete, checking the code and times spent on tasks.
I am looking to provide a list of tasks and for you to price each task. I have added a screenshot below.
Some tasks can be done as add-hock tasks as they are simple updates/changes to already made templates, some tasks are more in-depth tasks that require time and work.
UK developers or English as your first language only due to communication and difficulty of some tasks.
i have just set a budget but understand it will be on a price per task and will change. Tasks are added and continue work / development.