When you tally up all that time, and the fact it takes on average hours to become best friends with someone, it's no surprise many people form close bonds with their workmates. Decide in advance what you'd like to do - for example, going out for coffee, or perhaps getting a drink together after work if you're both old enough to drink. All work-based relationships do not lend themselves to either friendships or dating relationships. Log in using your social network account. Be polite and respectful. One of you may end up feeling obligated to leave your department or the company altogether.
For example, will the romance be a secret?
Avoid sending romantic messages through your work email. But for non-startup situations, you can probably find a way. When my ex and I started dating, it was a very strange circumstance.