OneFuzz is a self-hosted Fuzzing-As-A-Service platform that enables continuous security testing through automated fuzzing capabilities. Originally developed by Microsoft Research (MSR), the platform has evolved into a significant internal infrastructure component within Microsoft's security ecosystem. The platform provides developers with automated fuzzing services designed to identify security vulnerabilities and quality issues in software applications during the development lifecycle. OneFuzz operates as a self-hosted solution, allowing organizations to deploy and manage their own fuzzing infrastructure rather than relying on external services. The platform focuses on integrating fuzzing into continuous development workflows, enabling developers to incorporate security testing as part of their regular development processes. By providing fuzzing capabilities as a service, OneFuzz aims to make security testing more accessible and systematic for development teams working on various software products.