Case Study

Case Study: How a Chicago Manufacturer Reduced Invoice Processing Time by 85%

By Peter Schliesmann7 min read
Case Study: How a Chicago Manufacturer Reduced Invoice Processing Time by 85%

Executive Summary

A Chicago-area precision manufacturing company with 85 employees was processing 400+ supplier invoices monthly using manual data entry. This resulted in:

  • 40+ hours weekly spent on invoice processing
  • 12% error rate requiring costly corrections
  • 7-10 day payment cycles straining vendor relationships
  • $58,000 annual labor costs for invoice processing

In 90 days, Dooder Digital implemented an AI-powered invoice automation solution that:

  • ✅ Reduced processing time from 40 hours/week to 6 hours/week (85% reduction)
  • ✅ Improved accuracy from 88% to 99.8%
  • ✅ Cut payment cycles from 7-10 days to 2-3 days
  • ✅ Saved $47,000 annually in labor costs
  • ✅ Achieved 320% ROI in first year

The Challenge

Business Context

This precision manufacturing company specializes in machined components for aerospace and medical device manufacturers. As the business grew from $12M to $22M in revenue over three years, invoice volume increased from 180 to 400+ monthly invoices.

Pain Points

Manual Data Entry Bottleneck

  • AP team manually entered data from PDF invoices into QuickBooks
  • 40+ hours weekly spent on data entry
  • Process couldn't scale with business growth

High Error Rate

  • 12% of invoices contained data entry errors
  • Errors caused payment delays, duplicate payments, and vendor disputes
  • 8-10 hours weekly spent on error correction

Cash Flow Impact

  • 7-10 day invoice processing cycle
  • Missed early payment discounts (2% net 10)
  • Strained relationships with key suppliers

Staff Burnout

  • AP team overwhelmed during month-end
  • High turnover in AP clerk position
  • Limited time for strategic financial analysis

Technical Environment

  • Accounting: QuickBooks Desktop
  • Invoice receipt: Email (PDF attachments)
  • ERP: Epicor Prophet 21
  • Volume: 400-450 invoices/month
  • Supplier diversity: 200+ active vendors

Our Solution

Discovery & Assessment (Week 1-2)

Process Mapping

  • Shadowed AP team for 3 days
  • Documented current invoice workflow
  • Identified 12 distinct process steps
  • Analyzed error patterns and root causes

Requirements Gathering

  • Interviewed AP manager, CFO, and procurement
  • Reviewed sample invoices from top 50 suppliers
  • Assessed QuickBooks integration requirements
  • Defined success metrics and acceptance criteria

Solution Design (Week 2-3)

Technology Selection

  • AI Platform: UiPath Document Understanding with custom ML model
  • OCR Engine: UiPath Intelligence OCR + Google Cloud Vision API
  • Integration: QuickBooks Desktop API via Web Connector
  • Validation: Custom business rules engine
  • Workflow: UiPath Studio for exception handling

Architecture

Email → UiPath Orchestrator → Document Understanding →
Validation Rules → QuickBooks API → Exception Queue →
Human Review (if needed) → Approval → Posting

Implementation (Week 4-10)

Phase 1: ML Model Training (Week 4-6)

  • Collected 800 historical invoices across 50 suppliers
  • Trained custom ML model for data extraction
  • Achieved 94% field accuracy on test set
  • Fine-tuned for client-specific invoice formats

Phase 2: Business Rules Development (Week 6-8)

  • Built validation rules:
    • PO matching (3-way match)
    • Duplicate detection
    • GL coding logic
    • Approval routing based on amount
  • Created exception handling workflows
  • Developed reporting dashboards

Phase 3: Integration & Testing (Week 8-10)

  • Connected to QuickBooks Desktop via API
  • Built secure email monitoring workflow
  • Tested with 100 sample invoices
  • Conducted UAT with AP team
  • Refined exception handling based on feedback

Phase 4: Training & Go-Live (Week 11-12)

  • Trained AP team on exception handling
  • Implemented parallel processing (bot + manual)
  • Monitored accuracy for 2 weeks
  • Transitioned to full automation
  • Documented standard operating procedures

Change Management

Team Enablement

  • 6 hours of hands-on training for AP team
  • Created video tutorials for common scenarios
  • Established weekly check-ins for first month
  • Repositioned AP clerk role to focus on vendor relationships

Stakeholder Communication

  • Monthly steering committee updates
  • Vendor notification of faster payment processing
  • Finance team training on new reporting dashboards

Results & Impact

Quantitative Outcomes

Efficiency Gains

Metric Before After Improvement
Weekly processing hours 40 hrs 6 hrs 85% reduction
Avg. time per invoice 6 minutes 0.9 minutes 85% reduction
Human touch rate 100% 15% 85% automated
Invoices processed/day 20-25 120+ 4.8x increase

Quality Improvements

Metric Before After Improvement
Data accuracy 88% 99.8% 11.8 point increase
Duplicate payments 2-3/month 0 100% elimination
Missing PO tags 18% 0.5% 97% reduction
Exception rate N/A 15% Trackable & managed

Financial Impact

Category Annual Savings
Labor cost reduction $38,000
Duplicate payment prevention $5,400
Early payment discounts captured $3,600
Total Annual Savings $47,000

Investment & ROI

  • Implementation cost: $14,700
  • Annual licensing: $4,200
  • First-year ROI: 320%
  • Payback period: 4.5 months

Qualitative Benefits

Operational

  • AP team refocused on strategic vendor management
  • Ability to scale invoice processing without headcount
  • Real-time visibility into AP aging and cash flow
  • Reduced month-end crunch and overtime

Strategic

  • Faster payment cycles improved vendor relationships
  • CFO gained confidence in AP data accuracy
  • Created foundation for automated spend analytics
  • Positioned company for future AI initiatives

Employee Satisfaction

  • AP clerk role elevated to AP Specialist
  • Eliminated repetitive, error-prone work
  • Team engagement scores increased
  • Zero turnover since implementation

Client Testimonial

"Dooder Digital transformed our accounts payable process in just 90 days. We went from drowning in invoices to processing everything automatically with incredible accuracy. Our AP team loves the change—they're no longer doing mind-numbing data entry and can focus on building vendor relationships and strategic analysis. The $47,000 in annual savings is great, but the time savings and accuracy improvements are game-changing for our growth plans."

— CFO, Chicago Manufacturing Company


Key Success Factors

What Made This Project Successful

  1. Executive Sponsorship: CFO prioritized project and allocated AP team time
  2. Process-First Approach: We optimized the workflow before automating
  3. Realistic Expectations: Planned for 15% exception rate requiring human review
  4. Change Management: Positioned automation as empowering, not replacing staff
  5. Iterative Refinement: Monitored accuracy weekly and continuously improved ML model

Lessons Learned

Challenge: Initial ML model struggled with handwritten notes on invoices Solution: Added OCR confidence scoring; routes low-confidence items to human review

Challenge: AP team anxious about job security Solution: Reframed as "augmentation," created new AP Specialist role with better responsibilities

Challenge: Integration with legacy QuickBooks Desktop required custom API work Solution: Built middleware layer; now reusable for other clients


Next Steps for the Client

Following the success of invoice automation, the client is now exploring:

  • Purchase Order Automation: Automate PO creation from approved requisitions
  • Spend Analytics: AI-powered insights into spending patterns and cost-saving opportunities
  • Vendor Management: Automated vendor onboarding and performance tracking
  • Predictive Cash Flow: ML models for cash flow forecasting

How Dooder Digital Can Help Your Business

Is your organization struggling with manual invoice processing or other repetitive financial workflows?

We can help you achieve similar results:

  • ✅ Free 30-minute assessment of your AP process
  • ✅ ROI projection specific to your invoice volume
  • ✅ 90-day implementation timeline
  • ✅ Training and change management included

📞 Contact us today:


About This Case Study

Industry: Manufacturing (Precision Machining) Company Size: 75-100 employees, $15M-$25M revenue Location: Greater Chicago Area Project Duration: 90 days (discovery to go-live) Technologies Used: UiPath, Google Cloud Vision API, QuickBooks Desktop API Services Provided: Process Automation, AI Implementation, Change Management