How one invoicing app built five AI features without touching its legal records

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Slate, an invoicing and bookkeeping SaaS built for Israeli businesses, has integrated five AI-powered features into its platform. The app uses Angular, Express, Prisma, and Postgres, and issues documents that serve as legally binding fiscal records under Israeli law. Israeli regulations require these records to be stored for seven years, numbered sequentially without gaps, and never altered after issue. These legal constraints directly determined how each AI feature was designed and scoped. The five features include receipt scanning, a books-based chat assistant, a support reply drafter, natural language document creation, and smart column mapping for Excel imports.

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