During March 2025, contributed to the EssentialsX/Essentials repository by developing a configurable nickname validation feature that allows server administrators to define custom regular expressions for nickname patterns. This work involved backend development and configuration management, utilizing Java and YAML to implement a new regex setting. The feature was integrated across the ISettings interface, the Settings class, and the Commandnick module, ensuring consistent enforcement of the configured validation logic. By enabling tailored nickname policies, the update improved server security and reduced moderation workload. The approach demonstrated proficiency in config-driven design and regex-based validation, with coordinated changes across multiple backend components.