I could get into trouble with the rest of the tribe for telling you this, but us guys tend to see women one of three ways: 1. a strictly physical attraction or 2. relationship material or 3. "nice girl, but just wanna be friends"
Guessing is painful, and may be misinterpreted. I saw a study once where work is prob. the most usual place to meet potential boyfriends/girlfriends. However,
it can also put a a lot of pressure on both parties when the folks at work get involved. My suggestions are twofold: A. Take everybody at work out of it, and
politely, but firmly resist discussing ANYTHING, ANYTIME, ANYWHERE at work as work gossip is a real turnoff for some guys. 2. Take the guesswork out of this thing. When no one else is around, ask him out for coffee, or lunch on a day off. See how that goes. These are very safe type pre-dates. If you like the
way the coffee, or lunch goes, tell him nicely that you think he is an interesting guy, and that you wouldn't turn him down if he asked you out. If you get that far, leave it at that.
He's a big boy. He can figure the rest out. Most guys would be flattered, but be prepared to accept what he tells you.