Dma Radius Manager (Softlab) Ui/Ux Customization - Adapt look and feel end user Ui/Ux for refill cards

I look for developer with experience in DMA radius manager. I use DMA Radius Manager to sell internet packages. The end user buys refill cards and then selects the internet plan that want to buy (time, data, speed limit). The aim of the project is to adapt the design of the end user interface to make it modern and more suitable for mobile devices (responsive), so that the end customer logs in, redeems tokens and buys internet plans. DMA Softlab RADIUS experience is required. Please describe previous experience.