Worked on the elastic/beats repository to deliver file-based token authentication for CEL and HTTP JSON inputs in Filebeat. This feature enabled authentication tokens to be read directly from files and automatically refreshed without requiring service restarts, addressing the need for secure and efficient token rotation. The implementation focused on backend development and authentication mechanisms, utilizing Go and YAML to integrate seamlessly with existing input modules. By allowing tokens to update dynamically, the solution reduced operational downtime and improved security for users managing credentials. The work emphasized robust API development and thorough testing to ensure reliable, maintenance-friendly authentication workflows for Filebeat deployments.