Four-Eye Approval Workflow System

Designed and implemented a comprehensive approval workflow system for BCB Group that requires a four-eye process for any user actions that change data. This system is essential for safeguarding against internal fraud and meeting banking regulatory requirements. The workflow engine handles complex approval scenarios including multi-level approvals, delegation, escalation, and time-based expiration. It integrates seamlessly with all internal consoles and microservices, ensuring that no critical data modification can occur without proper authorisation and review. This capability was instrumental in BCB Group obtaining their French EMI licence, demonstrating the company's commitment to operational security and regulatory compliance.

The approval workflow system implements an event-sourced architecture ensuring complete auditability and the ability to reconstruct the approval history at any point. The system consists of: 1. Workflow Engine: Manages approval state transitions and routing 2. Notification Service: Handles real-time and email notifications 3. Audit Service: Records all approval events for compliance 4. Integration Layer: Connects with all data-modifying services CQRS pattern separates read and write operations, allowing for optimised query patterns for approval dashboards while maintaining strict consistency for approval decisions.