The site-specific integration cell line development platform, AlfaCell, integrates fluorescence-based visual selection with site-specific integration (SSI) technology to enable precise insertion of genes of interest into stable, high-titer, and high-quality genomic hot spots. The platform enables rapid generation of high-yield and stable cell lines within 1.5 months, and early prediction of product quality within 1 month, empowering clients to accelerate the development of cell lines ready for large-scale industrial manufacturing.