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# System Integration Tester (GS4 - Payment Systems)

- **Company:** MNK Infotech, Inc.
- **Location:** Greensboro, NC, United States
- **Contract:** Temporary contract
- **Skills:** Application Programming Interfaces (APIs), System Configuration, Software Debugging, Payment Systems, E2e Testing, System Integration Testing, System Testing, Systems Integration, Transmission Control Protocol (TCP), Performance Testing
- **Published:** July 23, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=00fa8973e168f402

## About the Role

* Retail - Fueling experience, e.g. dispensers, pumps, etc. (bonus)
 * Working experience with payment hosts, in addition to payment software (bonus)
 * Hardware / terminal setup and environment enrollment experience

## Description

Our Client is a global leader in integrated technology solutions for payment systems and retail petroleum - spanning payment software, point-of-sale, retail fueling equipment (dispensers, pumps), and payment host connectivity.

This profile is a technical / architecture-leaning System Integration Tester - distinct from functional or API-level QA testing, which the existing team already covers.

POSITION PURPOSE

To independently own end-to-end system integration, non-functional, and resiliency testing of payment systems components at the GS4 stage gate - and to represent the technical position of the project directly with the customer.

Core functions:

 * System integration testing across multiple components
 * System testing and non-functional testing
 * End-to-end, customer-focused testing
 * Resiliency testing
 * Technical architecture ownership and customer communication
 * Competency in hardware environment setup/ debug with minimal dependency, 1. System Integration & System Testing
 * Validate integration of multiple components at the GS4 stage gate
 * Execute system-level and non-functional test coverage
 * Ensure resiliency of the solution under failure and edge conditions

 2. End-to-End & Customer-Focused Testing
 * Design and run end-to-end scenarios that reflect real customer usage
 * Confirm the solution is ready for customer promotion through the stage gate

 3. Technical Architecture & Protocol Depth
 * Explain current system architecture and design decisions in detail - not just the QA process around them
 * Demonstrate strong working knowledge of the TCP protocol used for payment communications
 * Investigate and resolve issues down to the protocol / architecture level

 4. Ownership & Continuous Improvement
 * Take increasing accountability for the project's technical delivery over time
 * Build independent capability on terminal / hardware environment setup and TCP-level debugging (initial setup support provided)

This role sits at the GS4 stage gate, where multiple integrated components must be validated end-to-end before a solution can be promoted to the customer.

Essential skills:

 * System Integration Tester scope: system testing, non-functional testing, end-to-end testing, customer-focused testing, resiliency testing, etc.
 * Payment Systems / Terminal
 * Payment Software
 * Software automation
 * POS (Point of Sale)
 * Strong understanding of the TCP protocol (used for payment communications)
 * Able to explain current project architecture and technical decisions in depth


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