Grant Street Group

Grant Street Group builds enterprise-scale SaaS software for government, focusing on tax collection, electronic payments and financial auction services. Founded in 1997 and operating across the United States, the company reports processing more than $50 billion in taxes and serving millions of people through government entities nationwide. Its products include TaxSys®, a property tax billing, collection and distribution platform; PaymentExpress®, a unified payment processing solution; and LienAuction® and DeedAuction®, online auction systems for tax-defaulted property sales of liens and deeds respectively.

The work spans several technical domains: SaaS, cloud computing, payment processing, parallel computing, database systems and government revenue management technology. The stated stack includes Linux, MySQL, Perl and SQL, together with proprietary parallel-computing frameworks developed in-house.

Government clients bring demanding requirements for security and compliance. The company cites PCI-DSS Level 1, SSAE 21 certification and comprehensive annual security audits, alongside a stated emphasis on reliability and scalability. Its record in government digital transformation dates back to its founding in 1997.

Industry verticals served include government, tax collection and revenue management, electronic payments, financial auction services and property tax. Further details are available at https://grantstreet.com/.