Architected real-time data streaming using Server-Sent Events (SSE) to update sales agents instantly on lead assignments.

Offloaded heavy background computations to Node.js Worker Threads to prevent main thread blocking during lead generation.

Integrated Web Push Notifications to alert agents on new assignments and follow-ups without requiring them to keep the tab active.

Built granular role-based access control, appointment scheduling, and optimistic UI updates via React Query and Zustand.