Worked on the navikt/pensjonsbrev repository to deliver a parameterized multilingual template documentation testing feature. Developed a test suite in Kotlin and Java that generates and persists JSON documentation for all letter templates across supported languages, enabling diff-based validation for template consistency. Introduced a dummy FeatureToggleService to facilitate comprehensive testing and support diff workflows, ensuring that documentation remains accurate as templates evolve. Focused on backend development and testing, the work improved cross-language consistency and reduced risks in template rendering. The approach emphasized maintainability by producing diff-ready outputs, streamlining future updates and making it easier to validate changes across multiple languages.