September 2025 monthly summary for iza-institute-of-labor-economics/gettsim: Focused on stabilizing vectorization policy handling in Gemeinschaft calculations to improve correctness and reliability for Bedarfsgemeinschaft and Einstandsgemeinschaft computations. Delivered a targeted bug fix with clear policy defaults and minor type-hint improvements to reduce edge-case errors.

August 2025 monthly summary focusing on delivering stable release readiness, documentation, API consistency, and targeted tax-logic fixes across two repositories. The work emphasized packaging integrity, maintainability, and customer-facing improvements, aligning with business value of reliable releases and accurate computations.

July 2025 monthly summary for development focused on architectural modernization of Gettsim and packaging improvements for ttsim-backend, with a strong emphasis on reliability, maintainability, and distribution readiness. Highlights include major framework migration, internal restructuring, enhanced error handling, data integrity fixes, and packaging automation for broader deployment.

March 2025 — Delivered GETTSIM GEP 6: a DAG-based unified architecture with policy namespaces and conditional decorators, including parameter pre-processing for flexible and robust policy function invocation. This architectural upgrade reduces integration risk, accelerates feature delivery, and improves testability and maintainability, setting the stage for modular policy modules.