Payment & POS Transaction Processing System

Overview

Senior-level C++ software engineering project focused on payment transaction processing and POS terminal software.

The system was developed for a financial/payment environment using Modern C++, Qt, Embedded Linux and ISO 8583-based transaction processing.

Key Areas

• POS terminal software development
• ISO 8583 transaction processing
• Payment middleware
• Secure transaction communication
• Embedded Linux
• Network communication
• Multithreading
• Error handling and transaction reliability
• Performance optimization

Technologies

C++17 Qt Embedded Linux ISO 8583 TCP/IP TLS OpenSSL Multithreading CMake Git

Responsibilities

• Designed and implemented payment transaction processing components.
• Developed ISO 8583-compliant middleware.
• Implemented communication between payment components.
• Worked on secure transaction handling and communication.
• Investigated and resolved transaction processing issues.
• Optimized system performance and reliability.

Results

• Improved system performance by approximately 30%.
• Reduced transaction-related errors by approximately 25%.

Confidentiality

The project description has been generalized to protect confidential company, customer and implementation-specific information. No proprietary source code, credentials, keys, customer data or confidential architecture is included.