CASE STUDY / POINT OF SALE PLATFORM
Cafenet POS
Desktop POS developed end-to-end to digitize manual fiscal invoicing, speed up product selection and improve sales, cash and inventory control.
System flow
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Project Snapshot
Responsibilities, stack and scope for an end-to-end desktop POS delivery.
- Gathered requirements and analyzed the fiscal invoicing workflow.
- Built the C# Windows Forms application and SQL Server integration.
- Handled deployment, user training and post-launch support.
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The challenge behind the project
Cafenet relied on manual fiscal invoicing where products, calculations and invoice records were handled with limited system support.
The manual workflow made invoice preparation slower and increased operational friction during customer service. The business needed faster product search, accurate invoice calculations and better control of generated invoices.
- Fiscal invoicing rules had to be understood before implementation.
- Invoice totals required clear formulas and breakdown criteria.
- Delivery had to fit a limited timeframe while users kept operating.
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From manual billing to controlled desktop POS
The implementation translated fiscal requirements into a Windows desktop workflow connected to SQL Server and supported by user training.
System flow
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Architecture & Technical Decisions
Desktop monolith with basic layer separation, built for a focused POS workflow.
Desktop UI
Windows Forms screens for product search, sales and billing workflows.
Application Logic
C# logic for fiscal calculations and POS behavior.
SQL Server Data
Centralized persistence for invoices, products, sales, cash and inventory.
Deployment & Support
ClickOnce or disk installation, user training and post-launch support.
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Key Challenges
The main constraints were fiscal understanding, calculation accuracy and delivery timing.
- 01 — Understand fiscal invoicing rules and SAR-related considerations.
- 02 — Translate invoice formulas into reliable calculation behavior.
- 03 — Deliver a usable POS within a limited project timeframe.
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My Contribution & Solution Highlights
Wilhen owned the full delivery path from business discovery to implementation and enablement.
- Gathered requirements and analyzed business operations.
- Planned tasks, estimated delivery and built the full desktop system.
- Integrated SQL Server data access and installed the solution.
- Trained users and provided support after launch.
System flow
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Business Impact
Invoices moved from 12–15 minutes to 3–5 minutes on average, an estimated 70% reduction in processing time.
- ≈70% faster invoice processing
- 12–15 min → 3–5 min billing flow
- Reduced manual calculation errors
- Improved sales, cash and inventory control
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Lessons learned
Building the right solution required understanding the fiscal process before writing software.
- Business knowledge and technical implementation had to evolve together.
- Fiscal calculations required domain clarity, not only coding execution.
- Training and support were essential parts of a successful delivery.
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Next Evolution
Continue improving operational visibility, maintainability and usability as business processes evolve.
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