• Refactored codes for adding the central server to achieve cross-server events in MMORPG.• Originated to design and implement abstract classes about the synchronization and broadcast between the central server and the player’s server, which lightened the workload of our group and greatly reduced the redundancy code of all cross-server events.• Collaborated on optimizing the cache management with the AI team, using RL-based methods to predict the data in the player's vision domain from player’s actions. Increased the average cache hit rate by 7%.• Designed and built the guild battle system, met multiple requirements including implementing the matching of multiplayer battle fields, active/passive skills, and etc.• Collaborated on implementing reinforcement learning SDK service with AI team, which includes providing training related interfaces and adding the robot into the game. Simplified the work procedure for both groups.• On-call for the AI team to deal with logs reading, bugs fixing in the fighting system and version control.