RadiusIQ was built in PHP on the CodeIgniter framework. The estimation algorithm uses Google APIs to reverse geocode addresses and calculate the home value based on a variety of coordinate-based data points.
Ben Inkster was the software architect and team lead on this project. He designed the system including all data models, APIs, client front-end, client back-end, administrative back-end and e-mail delivery system. There were two other programmers that worked under his direction to bring this product to market.
To get a sense of what the system does, check out the sales video below: