Developed a security-focused feature for the get-convex/convex-helpers repository, introducing a configurable default-deny policy for row-level access control. This work centered on creating the RLSConfig object within the rowLevelSecurity module, which centralizes access policies and enforces explicit, per-table rules to minimize the risk of unintended data exposure. The implementation, written in TypeScript and leveraging backend development skills, refactored existing access control logic to support easier policy updates and improved alignment with database security and compliance requirements. The feature was delivered with a focused scope, ensuring minimal code surface area and a clear, auditable review process for future enhancements.