. >> reporter: dion lim runs simplyhired.com, one of the nation's largest job search engines. he says engineers and programmers are in short supply and high demand. that's because not enough american students are interested in math and science, and u.s. immigration policy caps the number of foreign workers. >> in silicon valley right now there are about 40,000 to 50,000 engineers, computer software engineers and programmers. simplyhired.com has 16,000 job listings for those positions. so, for every three engineers who are employed, we have one open position. over the last two years, we've seen about a 44% growth in engineering jobs. >> reporter: the skyrocketing demand for programmers and engineers is driven by new technologies. social media, tablets, smart phones and cloud computing. silicon valley startup seamicro makes servers for cloud computing. c.e.o. andrew feldman says his staff looks everywhere for top talent. >> we are recruiting not just in the u.s., but we are recruiting abroad as well, at top universities. we're going out of the state of california, which is somet