During November 2024, Taemin Kim refactored the core modules of the kestra-io/kestra repository to adopt Java’s pattern matching for instanceof syntax. This work unified and modernized type-checking logic across the codebase, replacing legacy instanceof usage to improve readability and maintainability. By consolidating these changes into a single, traceable commit, Taemin enabled easier code reviews and future refactoring efforts. The update focused on code quality and maintainability, ensuring safer core code paths and facilitating faster onboarding for new contributors. Throughout the project, Taemin demonstrated strong Java development and refactoring skills, emphasizing disciplined, maintainability-focused engineering practices.