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Don Kjer is a Principal Software Engineer at Roblox, with extensive experience in the virtual world domain. Previously, as Chief Architect at Wookey Technologies, Don led the engineering organization for the Sansar platform, achieving a 34% reduction in AWS costs through technology migrations and system improvements. At Linden Lab, Don served as Senior Software Architect, designing scalable back-end architecture for Sansar and optimizing the Second Life platform through comprehensive software analysis and modular service deployment. Early career phases included roles as System Administrator at Armored Internet and Software Developer at Seidcon, Inc., where Don worked on various projects and government contracts, applying innovative algorithms for optimization.