Before paying anything close to that, I'd want the deliverables in writing: exactly how many mocks, who runs them (a working engineer vs. a sales coach), and what the refund or exit terms are if the matches don't fit. A lot of what agencies sell — resume edits, a target-company list, and regular mock interviews — can be organized yourself with notes and a study partner, which is how I do my follow-up drilling. The red flag for me would be any promise tied to outcomes rather than effort, since no service controls hiring decisions. What part of the process feels hardest for you to do alone — is it the mocks, the applications, or knowing what to fix after a rejection?