Php developer in London

General information for the website: custom website made with codeigniter Kind of development: Customization of existing website Description of requirements/features: Dear Developers, We are looking to create a function to calculate a value from a json. This task will involve to: 1. create 2 buttons into an existing page to retrieve a starting and ending time. 2. store the times into the db 3. create 1 button to select some option to add (from a json) 4. store those options into the db 5. calculate this value from the difference of the 2 times multiplying a value from the json. 6. store this value into the db 7. display value in a textfield on the same page All the above should be created using a view and a controller in order to be compatible with codeigniter. This job should be done into our office on one of our pc since we can't send any code. Please apply if you believe you will be able to accomplish the task properly. We are looking for someone that could possibly become our trusted freelancer. Thank you very much. Extra notes: