Payment Tester Engineer

Location: St. Louis, MO (Hybrid) • Full‑time (Permanent)

Responsibilities

• Perform end-to-end testing of payment transaction processing applications using T3 tools.
• Design, develop, and execute manual and automated test cases for payment authorization, clearing, settlement, and related transaction flows.
• Analyze and validate ISO 8583 message formats, transaction routing, and authorization responses.
• Develop and maintain automation frameworks and test scripts for regression and functional testing.
• Execute testing in Unix/Linux environments, including log analysis and troubleshooting.
• Validate application functionality across multiple payment networks and transaction types.
• Collaborate with developers, business analysts, and support teams to identify and resolve defects.
• Participate in requirement reviews and provide test effort estimates.
• Perform root cause analysis of production issues and verify fixes through regression testing.
• Create and maintain test plans, test cases, test data, and test execution reports.
• Support Production validation activities.

Qualifications

• 5 to 8 years of experience in the payments industry.
• Hands‑on experience with T3 tools.

Skills

• Knowledge of C, C++, and scripting languages.