Senior QA-Ingenieur / Tester

Directed the end-to-end QA lifecycle for critical Web & Mobile projects spanning AI, SaaS, FinTech, Healthcare, and EdTech sectors. Architected and sustained robust test automation frameworks from scratch using Appium and Python, integrating them into CI/CD pipelines to ensure continuous delivery. Mentored and successfully onboarded 4 Junior/Middle QA engineers, conducting regular technical training, code reviews, and delegating complex automation tasks. Spearheaded Shift-Left testing efforts for flagship company projects, collaborating closely with developers and BAs during the requirement gathering phase. Validated complex backend microservices via API testing (Postman) and verified critical data accuracy using Firebase and Google Console. Key Achievements: Slashed regression testing time by 60% and achieved 90% automation coverage of critical functionality. Orchestrated the flawless deployment of Ficus and Tokime, driving UX improvements that contributed to a 10% sustained user growth.

Led the transition from purely manual to a hybrid testing approach by implementing comprehensive UI automation using Selenium, significantly increasing test coverage across 100+ unique product configurations. Engineered automated API test suites using Postman and JS to validate robust data exchange between microservices. Conducted rigorous integration testing for dozens of 3rd-party services: delivery (Nova Poshta), external billing systems (WayForPay, LiqPay, Portmone), and marketplace storefronts (Rozetka, Prom.ua). Performed targeted security testing focusing on common web vulnerabilities (SQL injection, authentication bypass, data leakage). Proposed architectural improvements and maintained high-quality bug tracking with clear reproduction paths and business risk assessments.

Established foundational functional and non-functional QA processes for a dedicated sports and fitness native mobile application. Validated core real-time features including workout tracking, live gym schedules, and dynamic user progress metrics under variable network conditions. Performed deep usability and exploratory testing, simulating real-world gym environments to provide actionable feedback that enhanced the athlete user experience. Collaborated with cross-functional team members to stabilize app performance and improve early-stage development workflows.