A senior contract FDE at $120/hr costs about $124,800 for a 6-month 40h/week engagement. An in-house FDE hire costs roughly $300k loaded per year (including $174k base, $80k equity value, and ~$46k in benefits/overhead) plus a 4–6 month recruiting cycle and $30k+ in recruiter fees. Break-even on cumulative cost sits near month 10. However, the real math is opportunity cost: every month without FDE capacity is enterprise deals that stall, churn, or go to competitors. If a single FDE engagement closes a $500K+ deal, the ROI is 3–4x in the first quarter alone.