Roczei focused on enhancing the stability of the apache/hadoop repository by addressing a critical bug in the Hadoop HTTP Web Proxy. Using Java and backend development skills, Roczei implemented robust parsing and null-safety checks for the yarn_knox_proxy parameter in HTTP queries. This work prevented NullPointerExceptions when handling multi-parameter query strings or absent queries, directly improving reliability for Spark client scenarios that route through the proxy. The solution aligned with ongoing YARN-11941 efforts, refining redirect-flag detection and ensuring safer URL processing. Roczei’s targeted engineering contributed depth by reducing production incidents and strengthening the correctness of backend web proxy logic.