There are several synonyms for the phrase "builds in" that can be used to convey a similar meaning. One option is "incorporates," which refers to adding or including something within a larger system or structure. Another alternative is "integrates," which suggests blending something seamlessly into an existing design or process. "Embeds" is also a possible synonym, indicating the act of firmly planting something within something else. "Implements" is another similar term, meaning to put something into practice or action. All of these synonyms express the idea of creating or establishing something within a larger framework or structure.