Working for Microsoft, Google and Apple, I not only became a better engineer – I became a better entrepreneur. Their successes and failures, encapsulated in these five lessons, provided me with invaluable instruction in how to build a company and effectively compete.

#1. Build a large network.
The “Biggies,” as I like to call them, have an unfair advantage: they have a network of literally thousands of experts. At Apple, I worked with some of the industry’s best designers. Microsoft has people who specialize in every conceivable role. At Google, I could walk down the hall and speak with the inventors of revolutionary technologies.

To compete with the biggies, you’ll need a network of your own. Get out to those start-up happy hours. Grab business cards. Set up coffee and lunch chats. And be open – you never know who might come in handy.