Own the quality strategy for key initiatives across frontend, backend, and data pipelines. Define test approaches, quality gates, and release criteria for distributed, event-driven systems. Design and build robust automation (TypeScript) for UI (Playwright), API/contract (REST/GraphQL, Pact), and event streams. Implement CI/CD quality gates, including parallelized test suites and flaky-test detection. Expand non-functional coverage: performance/load, resiliency/chaos scenarios, reliability SLOs, accessibility, and security checks. Build test data and environments using mocks, service virtualization, and cloud-native ephemeral environments. Partner across disciplines to design for testability and drive defect prevention. Integrate and validate AI-driven services, establishing evaluation datasets and bias checks. Mentor engineers on testing best practices, code reviews, debugging, and observability-driven testing. Instrument tests and systems for telemetry and continuously optimize execution time and coverage. Document quality architecture with diagrams and test plans. Collaborate with Principal/Distinguished Engineers to design testable, resilient solutions. Contribute to mobile testing where applicable.