Concise monthly summary for 2026-04 focusing on key features delivered, major bug fixes, impact, and technologies demonstrated.

March 2026 delivered a major enhancement to expression evaluation in Altinn/app-lib-dotnet via Arithmetic Expression Functions. Implemented plus, minus, multiply, and divide (renamed from devide to divide) with a decimal-based return type, improving precision and consistency across arithmetic expressions. Strengthened reliability through refactored evaluation paths and expanded unit tests, covering edge cases, large numbers (including numbers formatted as strings), and consistent error handling. The work included aligning test data structure, updating test names, and applying Code Rabbit feedback to simplify argument handling (two-argument arithmetic), which improved maintainability. These changes enable more powerful expression rules and reduce runtime errors in rule evaluation.

February 2026 (2026-02) - Altinn/altinn-studio: Focused on improving data accuracy for Norwegian administrative data and boosting maintainability through targeted code quality improvements. Delivered measurable business value by reducing data mapping errors and strengthening robustness in municipality data handling, while making the codebase easier to maintain and evolve.

January 2026 performance summary for Altinn/app-lib-dotnet: delivered a focused blend of codebase modernization and API usability enhancements that strengthen maintainability, onboarding, and downstream integration. Key changes were implemented with clear traceability and impact on developer experience.

November 2025 performance summary: Delivered key features enhancing safety, reliability, and performance across Altinn Studio and the Altinn 3 library; fixed test-related issues and improved test stability; implemented nullable reference types support and validation across code generation and AltinnStudioSettings; introduced a new code lists options provider with caching; completed substantial code quality and documentation improvements. Business impact: stronger type safety, reduced null-reference risk, faster onboarding for contributors, and more efficient runtime lookups.

Month: 2025-10. Focused on improving test infrastructure and maintainability for Altinn/app-lib-dotnet, setting the stage for more reliable CI and faster onboarding.