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AceStack • Toronto, Ontario, Canada
Role & seniority
Stack/tools
TSYS platform (TS2 or similar) in credit card processing
API testing: REST/SOAP
Tools: Postman, SOAPUI, Swagger; payloads in JSON/XML
Databases: SQL for backend validation
Agile/Scrum, defect tracking: JIRA, Azure DevOps
Top 3 responsibilities
Design, execute, and maintain API test cases; validate request/response payloads, errors, auth, edge cases
Validate credit card domain workflows (issuance, activation, authorizations/settlements, transactions, payments, refunds, disputes, chargebacks; interest calculations) per TSYS behavior
Validate TSYS backend processes, including postings, ledgering, GL entries, batch jobs; log defects and collaborate with cross-functional teams
Must-have skills
8–10+ years QA/testing experience; strong in credit card domain
Practical TSYS/TS2 platform experience
Strong API functional testing experience (REST/SOAP)
Proficient with Postman, SOAPUI, Swagger; JSON/XML validation
Solid understanding of credit card lifecycle (origination → servicing → collections)
Knowledge of authorization flows, ledgering, scheme messages, settlement logic
SQL for backend validations; familiarity with Agile/Scrum
Excellent analytical, debugging, and documentation skills
Nice-to-haves
API testing in cloud environments (Azure/AWS)
API automation frameworks (Rest Assured, Karate)
Experience with transaction monitoring tools or payment gateways
Loc
Job Title: API Tester (Credit Card Domain)
Location: Toronto, ON (Hybrid – 3 Days/Week Onsite)
Type: Long-Term Contract
Experience: 8+ Years
Job Summary We are seeking an experienced API Tester with deep knowledge of the Credit Card domain and hands-on TSYS platform experience (Issuer/Processor). The ideal candidate will validate APIs across credit card processing, transactions, ledgering, account setup, disputes, and payment workflows. Strong functional testing, API validation, and domain expertise in TSYS are essential.
Key Responsibilities API Functional Testing Design, execute, and maintain API test cases for REST/SOAP-based services. Validate request/response payloads, error codes, authentication, and edge cases. Perform functional, regression, integration, and end-to-end API testing. Credit Card Domain Testing
Required Skills & Qualifications 8–10+ years of QA/testing experience.
Mandatory: Strong hands-on experience in the Credit Card domain.
Mandatory: Practical experience with TSYS platform / TS2 tools. Strong experience with API functional testing (REST/SOAP). Expertise using Postman, SOAPUI, Swagger, JSON/XML. Solid understanding of credit card lifecycle processes (origination → servicing → collections). Familiarity with authorization flows, ledgering, scheme messages, and settlement logic. Strong knowledge of SQL for backend validations. Understanding of Agile/Scrum methodologies. Excellent analytical, debugging, and documentation skills.
Preferred Qualifications Experience testing APIs in cloud environments (Azure/AWS). Experience with API automation frameworks (Rest Assured, Karate, etc.). Experience with transaction monitoring tools or payment gateways. Bishnuu@acestackllc.com Show more Show less