RevOps keeps the revenue engine running: process, reporting, tooling hygiene. GTM engineering builds the engine: signal capture, enrichment, scoring, agent-run outreach, the demand layer, and the reporting spine. Most companies at the founder-led to sales-led crossing have neither yet. We install the engine, and your first RevOps or GTM hire inherits it documented. In one line: RevOps names the system; GTM engineering names the method.