Gregory Kim

A graduation advisement system built for a public community college. The system was later used by all the public community colleges in the state. It was eventually acquired and sold by the vendor that provided the school administration software for the community colleges.

The original project request was to write a graduation advisement system without any further detail being provided. I handled all the steps to make the project a reality, determining the requirements for such a system, then designing and coding it. In addition, I created documentation, conducted training, and assisted customers with setting up the system.

A subscription billing and management system built to support companies providing internet services. I co-designed and coded the system, while also serving as co-founder of a company to sell the system. The system has a server-room-style architecture with a relational database on the back end and a Windows application on the front end. Customers can choose Microsoft Access, SQL Server, or Oracle as the database server.

The system was used by hundreds of companies across 35 countries. Notably, Saleforce.com launched with this system as its billing platform. The system has also processed more than a billion dollars of credit card transactions. Most importantly, this project gave me substantial insight into maximizing customer retention and improving profit using a subscription business model.

A subscription billing and management system built in the cloud to support modern subscription business models. I was the primary architect of the system, while also serving as co-founder of a company to sell the system. It has a cloud multi-tenant architecture based on Microsoft Azure that was available from the day Azure launched. The system also included iOS and Windows Phone credit card applications I designed.

This was my second opportunity to create a subscription billing and management system from scratch. I got to test and refine ideas learned from my first system.