Senior Inżynier QA / Tester

I maintain quality and test more than 20 microservices in a core team of the company. I write automated tests, perform manual testing, do code reviews, contribute to the adoption of AI tools, and support production end-to-end tests used for revenue monitoring. Senior QA Automation Engineer with 7+ years in software quality engineering, including large-scale microservices and enterprise fintech. Strong focus on non-UI automation, API and service-to-service testing, reliability in high-load environments, and building maintainable test frameworks in Java (JUnit) and Python (Pytest). Experienced in gRPC/Protobuf, Kafka, Aerospike, and SQL/NoSQL databases; hands-on with CI/CD (Jenkins/TeamCity) and Docker. KEY IMPACT • Optimized end-to-end testing and regression strategy across multiple teams in a daily-deploy microservices environment. • Ensured quality of high-load backend services (300k+ RPS) via robust API/integration automation and incident-driven test scenarios. • Mentored and onboarded QA engineers; promoted best practices for automation, CI stability, and debugging. EXPERIENCE Quality Assurance Test Engineer (Core Platform / Microservices) PropellerAds | Apr 2019 - Present | Hybrid (Cyprus / Serbia) • Own quality for multiple core microservices; validate reliability, performance, and backward compatibility. • Develop and maintain automated tests for APIs and service-to-service flows; keep suites aligned with daily deployments. • Test high-load services (300k+ requests/sec) with focus on stability, fault scenarios, and safe rollouts. • Work with Aerospike, SQL/NoSQL databases, Kafka, Docker (incl. Docker Java API), gRPC and Protobuf. • Investigate production-like incidents using logs/traces and targeted automation; collaborate cross-team on fixes and framework improvements.