Every day of every year, IRS online services are used by people throughout the world. While the IRS is in constant operation, the demand for their services during the April filing season increases exponentially. Needing to support every transaction, the IRS must ensure system capacity is available to meet peak demands.
In 1999, IRS Enterprise Architecture directed developers to code every custom system executing on the Unix platform in C++. Software engineers developed two major systems in C++, a secure inbox to send requested transcripts to businesses and individuals, and a provisioning system that supported third party and employee account registration. Both systems saw a substantial increase in user demand during the April filing season. As IRS’s online presence grew, the demand on both systems increased beyond what they were originally designed to support. STP software engineers were tasked with finding a solution to the capacity issue.