Finance operations

A billing layer that watches and never touches

Visibility over the billing cycle with a hard constraint: it observes, it never posts a payment.

billing-observerin production
Client
Diagnostic imaging practice
Period
2026
Stack
Node.js, PostgreSQL, Linux
0
payments the system can post

The problem

Nobody could see the billing cycle end to end without logging into three systems, and anything that could post a payment was a compliance problem waiting to happen.

What I built

A read-only operations layer over the billing data with card data scope deliberately kept at zero, so the system stays outside payment compliance scope entirely.

Result

The cycle is visible, and the riskiest capability was never built in the first place.

Node.jsPostgreSQLLinux
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