Developed backend modules for the TKBM digital cooperative platform, covering savings, loans, marketplace, PPOB, payroll, and member balances.
- Built multi-tenant services with Express.js, PostgreSQL, and Redis, supporting multiple cooperative tenants.
- Integrated payment-gateway and PPOB services with transaction status handling and reconciliation workflows.
- Implemented balance movements and financial calculations across savings, loans, payroll, and marketplace transactions.
- Implemented PPh 21 (TER) progressive tax calculations for payroll.
- Supported hybrid mobile delivery using Capacitor and Progressive Web App capabilities.