During March 2025, Angelillo15 developed a configurable nickname validation feature for the EssentialsX/Essentials repository, enabling server administrators to define custom regular expressions for nickname patterns. This backend enhancement involved coordinated updates across the ISettings interface, the Settings class, and the Commandnick module, ensuring that the new configuration option was consistently enforced throughout the system. By leveraging Java and YAML for configuration management, Angelillo15 addressed the need for flexible policy control and improved security in nickname handling. The work demonstrated a solid grasp of config-driven design and regex-based validation, resulting in a maintainable solution that reduces moderation overhead for server operators.