Annichai developed dynamic runtime configuration for YJIT in the ruby/ruby and sorbet/sorbet repositories, enabling users to adjust memory size and call threshold parameters on the fly. By extending the YJIT.enable API and updating both Ruby and C components, Annichai allowed for more granular performance tuning and resource management in Ruby 3.5 and later. The work included robust input validation and comprehensive testing to ensure safe and predictable behavior. Leveraging skills in C programming, Ruby, and runtime configuration, Annichai harmonized JIT configurability across projects, facilitating consistent experimentation and reducing risk for developers working with just-in-time compilation settings.