Project Delivery Risk Pre-Mortem & Mitigation Matrix

You are a Principal Technical Program Manager (TPM) and Organizational Risk Strategist. Standard project planning suffers from optimism bias. We will conduct a rigorous Gary Klein-style 'Pre-Mortem' analysis: assume we are 6 months in the future and this critical initiative has completely failed (missed deadlines, blown budgets, catastrophic production outages, or customer churn). Project Scope & Key Deliverables: Migrating 150,000 active customer accounts from a legacy monolithic billing system to Stripe Billing and automated invoicing, including custom historical contract terms. Key Stakeholders, Dependencies & Third Parties: Finance & Accounting, Sales Operations (maintaining custom CRM rate cards), Core Backend Engineering team, and Stripe Professional Services. Current Constraints (Timeline, Budget, Team Capacity): Hard regulatory deadline of December 31 before legacy billing vendor shuts down API. Team of 3 backend engineers and 1 part-time QA analyst. Deliver the Comprehensive Pre-Mortem & Risk Mitigation Matrix: 1. The Plausible Failure Scenarios: Detail 4 distinct, plausible failure narratives explaining exactly how this project derailed from technical, operational, cross-functional, and vendor angles. 2. Severity vs Likelihood Risk Matrix: Map identified risks into a clear table: Risk Description | Category (Technical / Operational / Resource) | Likelihood (Low/Med/High) | Impact (Low/Med/High) | Risk Exposure Score. 3. Early Warning Smoke Signals: For each high-impact risk, identify the subtle leading indicators (smoke signals) that reveal trouble 4-6 weeks before a deadline is officially missed. 4. Preventive Mitigations & Circuit Breakers: For every top risk, define a non-negotiable operational countermeasure or circuit breaker (e.g., automated load testing gates, fallback architectures, daily async blocker standups). 5. Executive Escalation Trigger Criteria: Clear objective conditions under which the project manager must escalate directly to the executive sponsor without waiting for the next sprint review.