**Objective of This Role** As a QA Engineer, you will serve as the guardian of product quality. You will ensure the correctness of complex payment and lead logic, minimize financial risks, and safeguard product stability during releases. Your work will have a direct, long\-term impact on user trust and overall business success. **What You’ll Do** * Test web and mobile applications (iOS and Android). * Verify payment processes: Apple Pay, Google Pay, PayPal, and card payments. * Test registration, payments, and business rules related to lead processing. * Validate rule applications: pricing variations across traffic sources/countries, tax conditions, and proper email/notification flows. * Ensure stability and correctness of payment logic. * Perform functional and regression testing. * Use Postman (or similar) for API testing. * Apply Browser DevTools for request analysis and debugging. * Identify, document, and track bugs through resolution. * Verify product behavior with different traffic sources (organic and paid: Google, Facebook, TikTok, etc.). * Validate data/events in analytics systems (e.g., Google Analytics) at a basic level. * Support user acceptance testing (UAT) and assist stakeholders in release validation. * Collaborate closely with developers and product managers. **What You Bring** * Proven experience as a QA Engineer in manual testing of web and mobile applications. * Strong understanding of client\-server architecture and request/response workflows. * Proficiency with Postman for API testing. * Expertise in Browser DevTools. * Basic knowledge of web analytics systems (Google Analytics or similar). * Awareness of payment systems specifics with high attention to detail. * Ability to assess risks and identify areas affected by new features. * Proactive mindset for improving QA workflows and tools. * Strong sense of responsibility, ownership, and collaboration. **Experience In** * Manual testing of UI and API. * Validating business logic in high\-load services. * Bug reporting and tracking in Jira (or similar). **Knowledge Of** * HTTP fundamentals and client\-server interactions. * Approaches to regression and integration testing. **Nice to Have** * Experience testing integrations with external services (e.g., payment providers). * Hands\-on testing with real mobile devices (iOS/Android). * Basic knowledge of test automation (Selenium, Playwright, Python/JS). * Willingness to learn and grow in automated testing (UI and API).