Developed comprehensive Ruby Signature (RBS) type definitions for the ruby-odbc gem within the ruby/gem_rbs_collection repository, focusing on core modules such as Database and Statement, as well as data types, error handling, and SQL constants. The type definitions were meticulously derived from the gem’s C source code and existing test suite, ensuring accuracy and alignment with actual behavior. This work enhanced static analysis capabilities and improved IDE support, enabling safer downstream integration for Ruby-ODBC users. By standardizing type interfaces, the contribution strengthened maintainability, accelerated onboarding for new contributors, and established a robust foundation for future enhancements in Ruby gem development.