Wordpress Plugin Customisation

General information for the website: Plugin that displays job vacancies
Kind of development: Customization of existing website
Num. of web pages/modules: 1
Description of every page/module: We have a WordPress plugin that was developed to be used in our website but we need to customise it. The current plugin receives job posts from another website and it displays onto the website. It has a search box and also a list of recent jobs. When you click on the most recent job, you will see the actual job or if you choose to search for a specific industry sector, it will display the selected vacancies for that particular industry. When replying to this post, please don't forget to add the timeframe to customise this plugin.
Description of requirements/features: This plugin is currently installed in our test website and it works but we need some customisation to attend our needs. At the moment we only have one short code which is [Job_index].
Description of requirements/features: We require different short codes, one of them would be [Searchbox] that will show only the search box. It means that you would just need to hide the recent jobs coding from that file. On the search box, clients will be able to pick a industry sector and see the relevant jobs for that specific area. On the individual page for construction, we would like to have the most recent jobs displayed for the construction sector only. There are three short codes that we will need [Construction], [Trade] and [Medical].

Please find part of the existing code on Partial Code file attached.
Extra services needed: Customization
Specific technologies required: PHP
Extra notes: