Kenta Bell developed comprehensive Ruby Signature (RBS) type definitions for the ruby-odbc gem in the ruby/gem_rbs_collection repository. Drawing directly from the gem’s C source code and existing test suite, Kenta mapped out type definitions for core modules such as Database and Statement, as well as data types, error handling, and SQL constants. This work leveraged skills in Ruby gem development, static analysis, and type definition, enabling stronger type safety and improved IDE support for downstream users. The resulting RBS definitions enhanced maintainability, standardized interfaces for type-checking, and provided a robust foundation for future contributions and cross-team collaboration.