Description **Position:** Part\-time Senior Software Tester (Manual – Mobile) **Contract:** 3\-month engagement with possibility of extension **Location:** Candidate must be based in Buenos Aires **English:** C1 level required (excluyente) **Role Overview:** We are looking for a Senior Software Tester with solid experience in manual testing of mobile applications to join our team on a part\-time basis. The ideal candidate will be responsible for planning, executing, and documenting manual test cases to ensure the functionality, usability, and stability of mobile apps across platforms (iOS and Android). **Responsibilities:** Perform manual testing of mobile applications across various devices and OS versions. Create and maintain detailed test cases and reports. Identify, document, and track software defects using bug tracking tools. Collaborate with cross\-functional teams to ensure high product quality. Participate in sprint planning and reviews to provide QA input and feedback. Requirements Proven experience in manual mobile application testing (iOS and/or Android). Strong attention to detail and a structured approach to testing. Familiarity with bug tracking and test management tools (e.g., JIRA, TestRail). Very good command of English (written and spoken). Availability to work 20 hours per week . 4 years