Senior QA Engineer : Clients (Spark / GSUSA)
About us:
Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients. Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.
We are looking for a Senior QA Engineer (SDET) to support a critical payment gateway integration project involving PayArc. This role will focus on API testing, payment flow validation, automation, and end-to-end quality assurance across the transaction lifecycle.
You will work closely with engineering teams to ensure secure, reliable, and high-performance payment processing, while extending automated test coverage and supporting production rollout.
Key Responsibilities
- API & Payment Flow Testing
- Validate end-to-end payment workflows including authorization, capture, refund, void, and recurring billing.
- Perform API testing for PayArc integrations using tools like Postman / REST clients.
- Verify tokenization flows and ensure secure handling of payment data.
- Test routing logic (new vs existing payment processors).
- Test Automation & Quality Engineering
- Extend and maintain automated test suites for payment workflows and APIs.
- Build API automation frameworks (using JavaScript, Java, or Python).
- Integrate automated tests into CI/CD pipelines for continuous validation.
- Ensure strong regression coverage for all payment scenarios.
- Functional & Edge Case Validation
- Test success, failure, and edge-case scenarios (timeouts, retries, duplicate transactions).
- Validate idempotency and error handling mechanisms.
- Perform exploratory and manual testing for complex workflows.
- Data Validation & Reconciliation
- Validate transaction data across APIs and databases.
- Ensure accuracy in audit logs, payment records, and reconciliation flows.
- Write and execute SQL queries for backend validation.
- Performance & Reliability Testing
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- Conduct basic load and performance testing for payment APIs.
- Validate system behaviour under high transaction volume.
- Monitor and report latency, failure rates, and retries.
- Production Rollout & Monitoring
- Support production deployment validation and pilot rollout.
- Monitor transaction success rates and error logs post-release.
- Collaborate on issue triaging and quick resolution.
- 5+ years of QA experience with strong focus on API and backend testing.
- Hands-on experience with API testing tools (Postman, REST Assured, etc.).
- Experience in test automation using JavaScript, Java, or Python.
- Strong understanding of payment systems / payment gateways (highly preferred).
- Experience with SQL and database validation.
- Knowledge of CI/CD pipelines and automation integration.
- Understanding of HTTP protocols, REST APIs, and JSON.
- Familiarity with error handling, retries, and distributed system behaviors.
- Strong analytical, debugging, and problem-solving skills.
- Experience with Stripe, PayArc, or similar payment gateways.
- Experience with performance testing tools (JMeter, k6, etc.).
- Knowledge of PCI compliance basics and secure payment flows.
- Exposure to Agile/Scrum methodologies.
Tech Holding is proud to be an Equal Opportunity Employer and is committed to fostering a diverse and inclusive workplace. We welcome applicants from all backgrounds and experiences, and we consider qualified applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, veteran status, or any other legally protected characteristic. If you require accommodation in the application process, please contact our HR
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