Three things I would tell any NestJS developer before they write their first banking fraud detection rule

Short summary

A NestJS developer guide on avoiding common pitfalls when writing banking fraud detection rules. It warns against accumulating if-statements in a single validation method and instead recommends isolating each rule into its own class implementing a shared FraudRule interface. A rule-engine service loops through rules without needing modification when new rules are added, and each rule can be tested independently.

• •Avoid growing if-statement chains in a single validation method
• •Isolate each fraud rule into its own class implementing a shared interface
• •Use a loop-based rule engine so new rules require no core service changes

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