Worked on the civicrm-core repository to enhance the robustness and user experience of CRM templates by addressing network error handling in AJAX POST requests. Focused on front end development using JavaScript and AJAX, the work involved adding missing .fail() handlers to CRM.$.post calls, ensuring that network failures are properly detected and communicated to users. This approach improved reliability by surfacing alerts when requests failed, reducing user confusion and the volume of support tickets. The targeted JavaScript error handling patterns increased the resilience of core CRM interactions, providing better error visibility and contributing to a more stable user interface.