Senior QA Engineer

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 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
• • 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.).
• Good to have experience with Playwright
• 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.