During April 2026, Jaffar Keikei focused on backend development for the onyx-dot-app/onyx repository, addressing a critical issue in the Ingestion API. He identified and corrected inverted logic for the already_existed flag, ensuring the API accurately reflects document existence status. This Python-based fix improved the reliability of the ingestion workflow by reducing the risk of duplicate document processing and supporting accurate downstream analytics. Jaffar validated the solution with targeted tests, reinforcing data integrity and preventing future regressions. His work demonstrated a strong grasp of API development and backend systems, delivering depth in both problem analysis and technical implementation.