During November 2024, Fastjrun focused on backend development for the LianjiaTech/bella-openai4j repository, addressing a critical type-safety issue in batch processing with Zhipu AI. They refactored the Batch class by converting timestamp fields from Integer to Long, preventing potential data overflow and ensuring accurate batch processing times aligned with external API responses. This change improved data integrity and compatibility for downstream analytics, enhancing the reliability of batch operations. Working primarily with Java, Fastjrun demonstrated attention to detail in data modeling and integration, delivering a targeted bug fix that strengthened the robustness of the system’s backend processing pipeline.