Billing system integration for WIMAX/LTE and some other services.

We are IT support company located in Tokyo, Japan and are looking for an experienced senior or higher professional who has experience implementing billing system for LTE or Wimax system. I want to have the billing system based on various things, including data usage of each customer, discounts, issue invoice, automatic charging to bank account, automatic charging to credit card, etc. Able to work timely, precisely, and completely manner. Being able to work as a team. Being able to lead himself or herself with good understanding of project goals. Good communication skills in English, including writing technical documents with good organization. Good sense of organizing and prioritizing work and programming. Good troubleshooting through analysis of code and data, identify system issues and concerns, and provide resolution. Bachelor's Degree in Computer Science/Information Systems or equivalent in relevant work experience. Good communication skills in English. Over 3 years of experience in the field. Age restriction: between 27 and 40. We will use Skype, remote desktop, Teamviewer, and VNC to exchange information and discuss with Tokyo office frequently. In some cases, I may have to come to work with me.