Backend Inventory/Invoice System

Hello Freelancers, We are small workshop that repairs electronic equipment for local customers and it’s time to take our services to the next level. We are looking for custom backend for our small business. We have high criteria of technologies that the backend can be done with, these include HTML5, PHP, MySQL and Bootstrap 3 library, no other libraries or technologies can be used. We except brief documentation of the code. Freelancer must have ability to make few online calls via Skype or alternate method, so we as a project management can have discussion. Software requirements specification described below. Overview Backend will be build for company’s internal use. From the backend employee has ability to control: Tickets, Inventory, Customers, Employees and Invoices (SEPA). With these tools, employee should have brief overview of the business and service requests that customers has made. Please see the attachments for more information.