Common Securitization Solutions (CSS) builds and runs the technology behind a substantial share of the U.S. mortgage-backed securities market. Founded in 2013 as a joint venture between Fannie Mae and Freddie Mac, the company operates the Common Securitization Platform (CSP), a unified, cloud-native system that standardises the issuance and administration of mortgage-backed securities across both enterprises. The platform processes trillions of dollars in securities and handles roughly 71% of issuance and administration in the U.S. market, making it critical financial market infrastructure.
The engineering work centres on cloud-native platform development and high-availability systems. CSP runs on AWS using an Active/Active multi-region architecture designed for resiliency, with the stated outcome of zero data loss. Technical domains span mortgage securitization technology, cloud infrastructure engineering, and the operational demands of financial market infrastructure, where uptime and correctness are non-negotiable.
CSS serves a United States-based market with investors worldwide and operates across AWS regions. Its work sits within the financial services, housing finance, and government-sponsored enterprise sectors. The joint venture's stated purpose is to replace fragmented systems with unified technology in order to keep the U.S. housing market liquid, transparent, and efficient, with supporting American homeowners as a core part of its mission.
