(This post was inspired by Startup CXO and was originally published by Techstars on The Line.) In most startups, one of the founders is the first salesperson — often out of necessity as much as passion. But as startups scale they add sales reps or maybe some form of a Sales Manager once there are more than a couple of reps. But how do you know when to bring on a senior sales leader? Too soon and you have a very expensive employee, too late and your sales reps are creating their own processes and approaches. As a CEO there are several telltale signs that you need to hire a CRO, for example: You wake up in the middle of…