In tech: 程序员 (chéngxùyuán) = programmer, 小程序 (xiǎo chéngxù) = mini-program (very popular in WeChat). 程序 is also used for formal/legal procedures.
culture
WeChat 小程序 (mini-programs) are a huge part of Chinese digital life — millions of lightweight apps run inside WeChat for ordering food, shopping, paying bills, and more.