Develop and maintain automated end-to-end, smoke, regression, UI, API, and mobile tests across web, backend, iOS, and Android platforms. Collaborate with Engineering and Product teams on test strategies, expand automation coverage, reduce manual regression, resolve flaky tests, and automate manually discovered or customer-reported bugs. The role requires trading workflow knowledge, protocol testing experience, programming proficiency in Python, Golang, and TypeScript, and familiarity with broad automation, CI/CD, monitoring, performance, and security testing tools.