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.

• API & Payment Flow TestingValidateend-to-end payment workflowsincludingauthorization, capture, refund, void, and recurring billing.PerformAPI testingfor PayArc integrations using tools likePostman / REST clients.Verifytokenization flowsand ensure secure handling of payment data.Testrouting logic(new vs existing payment processors).

• Validateend-to-end payment workflowsincludingauthorization, capture, refund, void, and recurring billing.

• PerformAPI testingfor PayArc integrations using tools likePostman / REST clients.

• Verifytokenization flowsand ensure secure handling of payment data.

• Testrouting logic(new vs existing payment processors).

• Test Automation & Quality EngineeringExtend and maintainautomated test suitesfor payment workflows and APIs.BuildAPI automation frameworks(using JavaScript, Java, or Python).Integrate automated tests intoCI/CD pipelinesfor continuous validation.Ensure strongregression coveragefor all payment scenarios.

• Extend and maintainautomated test suitesfor payment workflows and APIs.

• BuildAPI automation frameworks(using JavaScript, Java, or Python).

• Integrate automated tests intoCI/CD pipelinesfor continuous validation.

• Ensure strongregression coveragefor all payment scenarios.

• Functional & Edge Case ValidationTestsuccess, failure, and edge-case scenarios(timeouts, retries, duplicate transactions).Validateidempotency and error handling mechanisms.Performexploratory and manual testingfor complex workflows.

• Testsuccess, failure, and edge-case scenarios(timeouts, retries, duplicate transactions).

• Validateidempotency and error handling mechanisms.

• Performexploratory and manual testingfor complex workflows.

• Data Validation & ReconciliationValidatetransaction data across APIs and databases.Ensure accuracy inaudit logs, payment records, and reconciliation flows.Write and executeSQL queriesfor backend validation.

• Validatetransaction data across APIs and databases.

• Ensure accuracy inaudit logs, payment records, and reconciliation flows.

• Write and executeSQL queriesfor backend validation.

• Performance & Reliability Testing

• Conductbasic load and performance testingfor payment APIs.Validate system behaviour  underhigh transaction volume.Monitor and reportlatency, failure rates, and retries.

• Conductbasic load and performance testingfor payment APIs.

• Validate system behaviour  underhigh transaction volume.

• Monitor and reportlatency, failure rates, and retries.

• Production Rollout & MonitoringSupportproduction deployment validationand pilot rollout.Monitortransaction success rates and error logspost-release.Collaborate onissue triaging and quick resolution.

• Supportproduction deployment validationand pilot rollout.

• Monitortransaction success rates and error logspost-release.

• Collaborate onissue triaging and quick resolution.

• 5+ yearsof QA experience with strong focus onAPI and backend testing.

• Hands-on experience withAPI testing tools(Postman, REST Assured, etc.).

• Good to have experience withPlaywright

• Experience intest automationusingJavaScript, Java, or Python.

• Strong understanding ofpayment systems / payment gateways(highly preferred).

• Experience withSQL and database validation.

• Knowledge ofCI/CD pipelinesand automation integration.

• Understanding ofHTTP protocols, REST APIs, and JSON.

• Familiarity witherror handling, retries, and distributed system behaviors.

• Strong analytical, debugging, and problem-solving skills.

• Experience withStripe, PayArc, or similar payment gateways.

• Experience withperformance testing tools(JMeter, k6, etc.).

• Knowledge ofPCI compliance basics and secure payment flows.

• Exposure toAgile/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