Hello,
We have read the job description and we can develop a Purchase Order Management system with required modules. We would like to propose you to develop this system based on free open source CRM software.
Our skills: Php, Yii, Laravel, HTML, CSS, Bootstrap, MySQL, CMS Wordpress, Opencart, Prestashop, Drupal, Joomla, etc. You can see our profile here https://www.freelancer.com/u/Webln .
Let's talk about your project in detail! Waiting for your response!
With regards,
WebIn team.