Tag: kotlin

All the articles with the tag "kotlin".

• Parsing XRechnung and ZUGFeRD: UBL, CII, and Embedded XML Extraction

  13 Feb, 2026

  A practical guide to parsing XRechnung (UBL and CII) and ZUGFeRD invoices — format detection, StAX streaming, PDF XML extraction, and normalizing into a common model.

• Building a Deterministic Invoice Validation Pipeline in Kotlin

  6 Feb, 2026

  How I designed a deterministic, versioned validation pipeline for e-invoices using Kotlin and Spring Boot — covering rule versioning, idempotent processing, async job queues, and audit requirements.