I don't know how they bootstrapped, but startups in Israel have repeatably same problems. Good technology, not so good business leadership, and zero hr skills. It's a known issue, that founders seek help with the minute they start interviewing people and getting frustrated from the pipeline, or the candidate reactions. This company (called 'added value') is unique since it provides a precise solution to that stage in a startups life and they phase out when you get to a certain size, helping the startup hire full time hr. They deliver results, and word travels fast.