40 Systems → One

When companies merge or acquire, the immediate challenge isn't strategy but rather the chaos of 30-50 disparate systems that don't talk to each other. Finance teams spend 40% of their time manually reconciling data across systems, executives can't get a unified view of the combined entity, and regulatory compliance becomes a nightmare with no unified audit trail. This playbook documents our battle-tested approach refined across 23 enterprise deployments in financial services, private equity portfolio companies, healthcare, and manufacturing.

This playbook fits organizations facing these common challenges:

• 0130-50 disparate systems from merged entities requiring consolidation with no clear integration path
• 02Multiple data formats with inconsistent standards, definitions, and business rules across legacy systems
• 03Finance teams spending 40%+ of time manually reconciling data instead of strategic analysis
• 04Regulatory compliance (SOX, GDPR, HIPAA) requiring unified audit trails that don't exist
• 05Executive mandate for aggressive 12-18 month timeline without any business disruption
• 06Political complexity with different teams owning different systems and resistant to change

• Phase 1 - Discovery & Assessment: Comprehensive inventory of all systems, data flows, dependencies, and ownership. Identify quick wins vs. complex integrations. Map regulatory requirements.
• Phase 2 - Architecture Design: Design target state architecture with unified data model. Define integration patterns (real-time vs. batch). Establish data governance framework.
• Phase 3 - Phased Migration: Execute parallel runs with automated validation before each cutover. Start with non-critical systems, build confidence, then migrate core systems.
• Phase 4 - Data Quality Gates: Implement automated checks catching 95%+ of issues before they impact downstream systems. Continuous monitoring and alerting.
• Phase 5 - Compliance & Audit: SOX compliance by design with audit logging, segregation of duties, and control frameworks built in from day one.
• Phase 6 - Change Management: Stakeholder communication plan, user training program, and organizational change management to ensure adoption.