Khan Hub ERP
Centralized multi-role operational ERP managing 16+ departments across 5 connected web properties with granular access control, financial logging, and LLM automation.
A hospital, rehab centre, college and welfare departments each ran on separate physical registers and spreadsheets. Fees, staff, salaries and departmental reports could not be tracked or audited in one place, causing operational delays and reconciliation friction.
- (01)One Next.js + TypeScript + Firebase system with separate logins and dedicated operational screens for 16+ departments.
- (02)Role-based access control (admin, cashier, staff) enforced through strict Firestore security rules and approval steps.
- (03)Comprehensive audit log recording every transaction, cashier submission, and record update with timestamps and user IDs.
- (04)Finance and cashier screens paired with interactive Recharts dashboards for revenue tracking.
- (05)Firebase Cloud Messaging (FCM) push notifications and Progressive Web App (PWA) installation support for staff devices.
- (06)Digital student admission system for the college with document verification gates.
- (07)Centralized donor register for the welfare division with receipt generation.
- (08)A 10-slide architectural proposal for a unified billing and medicine-stock system, starting as an active hospital trial.
- (09)Head-office AI voice assistant using Groq and Llama 3.3 70B with tool-calling, self-describing Firestore schemas, and two-tier memory.
- (10)Five connected websites integrated into the centralized ecosystem, including JobReel.
- (11)Hardware-level biometric fingerprint and facial recognition attendance integration (currently in progress).
Managed backend (Firebase) over custom Node servers.
Selected Firebase Auth, Firestore, and Security Rules so one developer can ship, secure, and maintain 16+ departments alone without running and babysitting custom server infrastructure.
Role-based access designed first, screens second.
Defined permission matrices and Firestore security rules before building UI screens, preventing cross-department data leakage and unauthorized cashier overrides.
Resolved production Cross-Origin-Opener-Policy (COOP) edge case.
A browser security header misconfiguration broke Firebase popup sign-in in production. Isolated the origin policy conflict, corrected server response headers, and documented the root cause.
AI coding agents used to speed delivery while I review and own every change.
Used AI coding workflows to accelerate component scaffolding while personally reviewing, validating, and owning every line of architectural logic and security rule.
Sole developer who unified 16+ departments and 5 connected websites into a single operational system.
Eliminated paper registers and disconnected spreadsheets across hospital, college, and head-office divisions.
Staff and cashiers now balance daily collections through verified, role-segregated audit trails (TODO_REAL_VALUE daily active records handled).