For my most recent venture I went into an existing market with hundreds of competitors (technical recruiting). I knew there was demand, though I did have to lea

For my most recent venture I went into an existing market with hundreds of competitors (technical recruiting). I knew there was demand, though I did have to learn specific tactics for selling this service. I stumbled on the idea by experiencing a problem with the shady/spammy nature of the technical recruiting industry and feeling like I had a better way. I've killed 5+ startups in the first few months though by prioritizing talking to potential customers over building software. Hard to do as an introvert that loves building things. My recommendation to get a full-time job comes from the belief that if you are so focused on coming up with a winning idea, it becomes more illusive. (See: http://paulgraham.com/startupideas.html http://paulgraham.com/startupideas.html)