Common Securitization Solutions is a joint venture between Fannie Mae and Freddie Mac established in 2013 to operate the Common Securitization Platform, a cloud-native system that standardizes the issuance and administration of mortgage-backed securities across the U.S. secondary mortgage market. The platform powers 71% of all mortgage-backed securities issuance and administration in the United States, processing trillions in securities annually whilst supporting millions of American homeowners.
The platform operates as critical market infrastructure, connecting the secondary mortgage market to global investors. In 2023, CSS implemented an Active/Active architecture across multiple AWS regions, achieving zero data loss and enhancing the system's resilience and disaster recovery capabilities. This technical foundation reflects the company's focus on reliability and continuous operation of a systemically important financial platform.
CSS operates across cloud-native platform development, distributed systems architecture, multi-region AWS deployment, and investor connectivity. The organisation combines the regulatory significance of operating on behalf of government-sponsored enterprises with the technical sophistication required to manage large-scale securities processing and maintain the stability of U.S. housing market infrastructure.