Worked on the allenai/OLMo-core repository to enhance code quality and maintainability, focusing on optimizer configuration and error messaging. Addressed a bug by fixing typos and clarifying comments and error messages across core modules, including distributed utilities, attention mechanisms, and training callbacks. Renamed a local variable to prevent misconfiguration errors, thereby reducing onboarding friction for new contributors. Applied cross-module quality improvements using Python, emphasizing code review and debugging skills. Documented all changes for traceability, supporting future maintenance and robust feature development. The work laid a foundation for improved developer experience and reliability within the OLMo-core codebase over the month.