Task 5: Workflow & Approval Engine

[dohogo]

Overview

Design and implement a flexible multi-level approval workflow engine that handles reimbursement requests with customizable approval rules.

Key Implementation Areas

• Workflow Engine Architecture: State machine design, rule engine, process definitions
• Approval Rule Configuration: Amount-based, departmental, project-based, and conditional rules
• Multi-level Approval Support: Sequential, parallel, conditional, and emergency approvals
• Approval Actions & Interface: Approve/reject, request changes, delegation, escalation
• Notification & Communication: Email, WeChat messages, system notifications, reminders
• Audit & Compliance: Complete audit trail, compliance reporting, access logging
• Performance & Scalability: Async processing, caching, database optimization

Acceptance Criteria

• Workflow engine creates approval instances from reimbursement requests
• Multi-level approval flows work with proper routing and escalation
• Configurable approval rules based on amount, department, and project
• Sequential and parallel approval scenarios execute correctly
• Approval notifications send through email and WeChat
• Audit trail captures all approval actions with timestamps and user details
• Delegation functionality handles approver absences seamlessly
• Performance targets met: workflow creation <1 second, state transitions <500ms

Business Rules Examples

• Amount < 1,000 CNY: Direct manager approval only
• Amount 1,000-10,000 CNY: Manager + Department head approval
• Amount > 10,000 CNY: Manager + Department head + Finance director

Estimated Effort: 3-4 weeks | Complexity: High

Dependencies: User management, notification services

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