Eli Greenfeld developed a security-focused feature for the get-convex/convex-helpers repository, introducing a configurable default-deny policy for row-level access control. By designing the RLSConfig object within the rowLevelSecurity module, Eli centralized access policies and required explicit per-table rules, reducing the risk of unintended data exposure. The implementation, written in TypeScript and leveraging Convex, emphasized backend development and database security best practices. This targeted refactor not only improved auditability and compliance alignment but also ensured a minimal and reviewable code surface. Eli’s work demonstrated depth in access control, delivering a robust foundation for secure and maintainable policy management.