Fintech QA Engineer: Payments & Gateway Testing

SLEM Technologies; United States; Remote; USD 65,000 - 95,000; Full time

Job summary

SLEM Technologies in the United States is seeking a skilled QA tester to validate payment applications and checkout journeys across MPGS and Visa Cybersource. You will collaborate with developers and senior QA engineers to ensure transaction accuracy and data protection for customer funds.

You will run manual and automated tests in sandbox environments, verify authorisation, capture, refunds, 3-D Secure, tokenisation, and reconciliation, and contribute to regression suites using SQL and the

Qualifications

• 2+ years of professional software testing experience, fintech or payments.
• Hands-on testing with MPGS and Visa Cybersource.
• Experience testing payment APIs and checkout journeys, incl. declines.
• Understanding of authorisation, capture, refunds, 3-D Secure, tokenisation.
• Basic SQL and familiarity with an automation framework.
• Awareness of PCI DSS and secure handling of test data.

Responsibilities

• Run manual and automated tests against sandbox integrations for both payment gateways.
• Verify successful payments, declines, 3-D Secure challenges, tokenisation, captures, refunds.
• Test duplicate submissions, timeouts, retries, gateway notifications, and status updates.
• Use SQL and API checks to verify amounts, currencies, ledger records, and reconciliation.
• Write clear, sanitised defect reports and validate fixes across flows.
• Maintain regression tests and use approved credentials and synthetic card data.

Skills

Software testing

Fintech

Payment processing

API testing

SQL

PCI DSS

Automation framework

Collaboration

Tools

MPGS

Visa Cybersource

Job description

SLEM Technologies in the United States is seeking a skilled QA tester to validate payment applications and checkout journeys across MPGS and Visa Cybersource. You will collaborate with developers and senior QA engineers to ensure transaction accuracy and data protection for customer funds.

You will run manual and automated tests in sandbox environments, verify authorisation, capture, refunds, 3-D Secure, tokenisation, and reconciliation, and contribute to regression suites using SQL and the