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CarTic: Real-Time Trading Platform
for Automotive Dealers

Production System • 16+ Years in Production

The Business Environment

The German used car market generates over 7 million transactions annually among 35,000+ professional dealers.

The Challenge

→ Tens of thousands of new listings appear daily on mobile.de and AutoScout24
→ Thousands of dealers compete simultaneously for the best deals
→ First to reach the seller wins the deal
→ Speed directly translates to revenue

Technical Challenges

What needed to be solved:

Real-Time Processing

Filter and structure tens of thousands of listings daily

Ultra-Low Latency

Instant detection of relevant offers

24/7 Availability

Production-grade reliability requirements

Speed Advantage

Speed optimization as core competitive factor

Telephony Integration

Automated call setup (VoIP + WhatsApp)

The Technical Solution

Developed System Architecture:

⚡

High-Performance Data Pipeline

• API integration with mobile.de and AutoScout24
• High-speed real-time filtering engine
• Automated structuring for instant decision-making
📞

Custom VoIP Infrastructure

• Built from the ground up for minimum call setup time
• Parallel multi-provider routing for maximum speed
• CarPhony Module: WhatsApp integration for automated calls
🏗️

Distributed Enterprise Architecture

• Dedicated search servers for continuous API polling
• Native desktop application for maximum performance
• Responsive web interface with live updates (WebSocket, no reloads)
• Mobile-optimized for purchasing decisions on the go

Technology Stack

Backend

C# / .NET
REST APIs
Real-time data processing

Frontend

Native desktop application (compiled code for maximum performance)
Web-based interface with WebSocket integration
Responsive, mobile-optimized

Telephony

Custom VoIP implementation
WhatsApp integration (CarPhony Module)
Parallel call control across multiple providers

Architecture

Distributed systems
Fault-tolerant 24/7 infrastructure

Results & Validation

16+ Years of Continuous Operation

✓ Proven in one of Europe's toughest markets
✓ Handles extreme load while maintaining near-instant response times
✓ Long-term system maintenance and evolution

User-Centric Development

✓ Iterative optimization of business-critical workflows in close collaboration with users
✓ Every interface detail perfected for error-free performance under time pressure
✓ Examples: Telephony strategies (auto-dial vs. click-to-call), busy handling, mobile workflows

Proven Competitive Advantage

✓ Dealers using the system win deals that competitors miss
✓ Long-term customer retention validates solution effectiveness

Core Competencies Demonstrated

🏛️

System Architecture & Design

Distributed systems for high-availability applications
High-performance real-time data processing at scale
API integration and data synchronization at scale
💻

Full-Stack Development

Custom infrastructure development (VoIP/telephony)
Desktop, web, and mobile applications
WebSocket-based real-time features
🎯

Problem-Solving Under Constraints

Optimization for speed in highly competitive environments
Fault-tolerant systems for 24/7 operations
Balancing performance, reliability, and maintainability in long-running production systems
🚀

Product Engineering

Translating complex business requirements into technical architecture
User-centric design with iterative optimization of business-critical workflows
Close stakeholder communication for business impact
Long-term system maintenance and technical debt management