We analyse race and gender trends in the Silicon Valley technology industry from 1980 to 2015, with a focus on education, employment and wages in computer science. Racial gaps in representation are more salient among programmers than in the overall technology labour force; in addition, we document a stable or increasing gender gap across all races in computer science. However, these demographic shifts are not always consistent with either a pipeline argument that there are insufficient supplies of potential underrepresented programmers or a wage explanation. Hispanic males, for example, have had increasing rates of computer science degree completions yet decreasing representation in the programmer labour force. On the other hand, White females have had decreasing representation among both degrees and the labour force despite comparatively high wages in the technology sector. The persistent and increasing race and gender gaps suggest that policies to attract underrepresented groups need to be differentiated by the group and may require significant changes in industry culture to increase the representation of these groups.