Wallun Data Processing, Inc. has been helping the construction industry for over 35 years by providing quality job cost accounting software and service.  In 1980, Jerry Klopfenstein became the Oklahoma dealer for A-Systems Accounting Software called Contractor III.  This was the original DOS based program provide by A-Systems.  In 1999, Jerry was instrumental in helping A-Systems transition from a DOS based system to a Windows based system.  During this transition, the current overview screens that we now enjoy were added to the program as well as many upgrades and additions.  A-Systems has continued to update and improve the program each year by incorporating customer requests.

Our goal at Wallun Data is to  provide quality products and services to our current and future clients. This goal has been passed down from one generation to the next. With over 50 years of combined experience on A-System’s JobView the staff of Wallun Data looks forward to continuing to service and meet your construction software needs.