One point of anecdata: I've typically found that recruiting sites like Hired and Triplebyte lean low on the comp scale when it comes to senior engineers. This

One point of anecdata: I've typically found that recruiting sites like Hired and Triplebyte lean low on the comp scale when it comes to senior engineers. This may be less of a gap in salaries, and more a gap in the kinds of companies using your service. The last time I used Hired, for example, it asked me to name a salary expectation - I put in ~my base salary at the time, and got an email soon after asking me to lower my expectations since nobody using Hired in NYC was willing to bite. Someone else brought up the fact that the data for major established companies look very different - AppAmaGooFaceSoft comp for seniors is overwhelmingly higher than this. But even within the realm of startups, I've interviewed at, and negotiated offers with startups in my area that are in a range that major recruiting sites (and their clients) seem unwilling to contemplate.