Senior Quality Assurance Specialist - System Security Expert Our ideal candidate will excel in complex, highly technical environments. You will be responsible for end-to-end manual and automated testing, ensuring that distributed services and endpoint applications are secure, reliable, and compatible. This role requires reverse-engineering bugs, writing integration test harnesses, validating client/server behavior, and thinking like an attacker or power user. Key Responsibilities: - Define and execute comprehensive test strategies across backend services, web frontends, and desktop apps. - Validate system behaviors, including synchronization, persistence, fault tolerance, and security. - Create detailed test plans and cases based on system behavior, API contracts, and workflows. - Design and implement automation at various levels (API, integration, UI). - Collaborate with development teams to identify issues early through ATDD or exploratory testing. - Assist in reproducing complex bugs, including writing minimal repro apps or network mocks. Requirements: - 5+ years of QA experience testing backend distributed systems, desktop apps, and full-stack web apps. - Hands-on experience testing Windows and macOS desktop applications, with knowledge of OS-level concepts. - Experience designing and executing manual and automated tests for REST APIs, message queues, and background services. - Understanding of software development frameworks, networks, and cybersecurity principles. - Familiarity with issue tracking, CI/CD, test management, and observability tools. Benefits: Holidays, Unlimited PTO. Additional Information: - Seniority Level: Mid-Senior level - Employment Type: Full-time - Job Function: Other - Industry: IT Services and IT Consulting