Multi-Tenant CRM

Built a CRM used by dozens of sales teams from schema to UI. Enforced tenant isolation with PostgreSQL row-level security so a query can never leak another workspace's data, layered role-based permissions on top, and designed an optimistic drag-and-drop pipeline that stays responsive on slow networks. Owned the GraphQL API, the Prisma data layer, and the React front end, plus the audit log that records every record change.