Riverstone Credit Union Core Teller System

We built a modern teller and back-office web application that sits on top of the existing AS/400 core through a thin middleware translation layer — so the cooperative did not have to rip out their general ledger. Every teller action is composed in the new UI, validated against business rules in real time, and submitted to the core as a single posted transaction. The teller now sees the member photo, signature card, last-five-transactions, and any compliance flags in one screen before they even greet the member. Supervisor overrides are routed in-app instead of by paper. Cross-branch coverage works because the workflow is identical at every counter. Reporting and audit run off a separate read replica of the middleware database, giving the compliance team direct query access without ever touching the core. We staged the rollout one branch at a time over fourteen weeks, with a rollback path to green-screen still active at each branch for the first seven days.