Worked on enhancing Fortran and C interoperability within the lfortran/lfortran repository by expanding the ISO_C_BINDING module. Delivered a feature that introduced the c_intmax_t constant along with several new character constants, broadening the available type mappings for seamless integration with C libraries. The technical approach focused on stable, incremental improvements without introducing major bugs, emphasizing reliability and maintainability. Utilized Fortran for core development, with a strong emphasis on C integration and software testing to ensure robust cross-language support. The work addressed integration friction for users embedding C code, resulting in a more versatile and developer-friendly Fortran interface.