Senior QA Engineer - Desktop and Distributed Systems Location: LATAM, Bogota, D.C., Capital District, Colombia We are seeking a Senior QA Engineer to 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 (built in .NET, C++, and React) 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: - Develop comprehensive test strategies across backend services, web frontends, and desktop apps on Windows and macOS. - Validate distributed system behaviors, including synchronization, persistence, fault tolerance, and security. - 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. - Drive quality in high-scale systems with multiple backend services and desktop agents. - Maintain and evolve test environments as requirements change. 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 .NET, C#, Win32 APIs, Swift, Objective-C, and web frameworks like React. - Familiarity with network protocols, security testing, and reverse engineering. - Proficiency with tools such as Charles/Fiddler, Wireshark, Postman, and custom test harnesses. - Comfort with issue tracking, CI/CD, test management, and observability tools. As a mid-senior level QA Engineer, you will play a crucial role in ensuring the quality of our software products. If you have experience testing complex systems and are proficient in a variety of programming languages and testing tools, we encourage you to apply for this exciting opportunity.