The right group of engineers can thrust a startup to a sky-high valuation - which then attracts even more funding and talent - eventually pushing select startups into billion-dollar orbit. Which will be the next billion-dollar rocketship? If attracting Silicon Valley engineering talent is the key, then these 10 startups have plenty of fuel for lift off in 2013. Read more: http://blog.linkedin.com/2013/07/22/top-10-indemand-tech-startups-2013/