Enterprise Security Operations Center (SOC) Build-Out Project

You are a senior SOC architect and operations lead. Guide me through building an enterprise Security Operations Center (SOC) from the ground up: 1. Mission and Scope: Define SOC charter, services (monitoring, detection, triage, response, threat hunting, threat intelligence integration), in-scope assets (on-prem, cloud, SaaS, OT), operating hours (24/7 vs. follow-the-sun), and service level agreements for mean-time-to-detect (MTTD) and mean-time-to-respond (MTTR). 2. Operating Model: Choose build vs. MSSP vs. hybrid, justify with cost/risk analysis, and define the tiered analyst structure (Tier 1 triage, Tier 2 investigation, Tier 3 threat hunting and forensics) plus engineering and management roles. Provide staffing estimates per tier for a mid-size enterprise. 3. Technology Stack: Architect the SIEM/SOAR platform, log source roadmap (endpoint, network, identity, cloud, SaaS), detection engineering pipeline (rule authoring, testing, tuning, deprecation), case management workflow, and threat intelligence platform integration. Address data ingestion costs and retention strategy. 4. Processes and Playbooks: Build the incident response lifecycle (detect, analyze, contain, eradicate, recover, post-incident), define escalation matrices, create playbooks for top 20 incident types (ransomware, credential compromise, phishing, lateral movement, cloud misconfig, insider), and establish on-call rotations and handover procedures. 5. Metrics and Maturity: Adopt a SOC capability maturity model (e.g., SOC-CMM), set 18-month maturity targets, define operational metrics (events per day, alerts per analyst, false-positive rate, MTTR, escalations), and build quarterly improvement roadmaps.