Manual QA Engineer - High-Traffic Mobile Applications

About the Role

We are looking for a Manual QA Engineer to join our mobile product team working on secure, high-traffic mobile applications for iOS and Android. This Manual QA Engineer remote position focuses on ensuring quality, stability, security, and compliance of mobile applications in a regulated, real-time environment. You will work closely with mobile engineers, backend developers, and product managers to validate complex user flows, integrations, and security-sensitive features.

What You'll Do

• Perform manual testing of mobile applications on iOS and Android platforms.
• Analyze product requirements, specifications, and designs to create clear and detailed test cases.
• Execute functional, regression, smoke, exploratory, and acceptance testing.
• Validate authentication and authorization flows (login, MFA, token handling, permissions).
• Test integrations with external APIs, payment systems, and third-party services.
• Validate real-time features, data synchronization, and state consistency.
• Perform mobile-specific testing including app lifecycle scenarios, network interruptions, and recovery.
• Identify, document, and track defects with clear reproduction steps and evidence.
• Collaborate closely with developers to investigate issues and verify fixes.
• Participate in release testing and support App Store / Google Play releases.
• Ensure high quality, usability, and stability across production releases.

Requirements

• 3+ years of experience as a Manual QA Engineer, preferably with mobile applications.
• Strong experience testing mobile apps (iOS and Android).
• Solid understanding of software testing fundamentals and QA processes.
• Experience working with test documentation: test cases, checklists, and test plans.
• Experience testing REST APIs (using Postman, Charles, or similar tools).
• Good understanding of client-server architecture.
• Ability to analyze logs and reproduce complex issues.
• Strong attention to detail and analytical thinking.

Nice to Have

• Experience testing fintech or payment-related applications.
• Understanding of security-sensitive flows (authentication, authorization, session handling).
• Experience with mobile traffic inspection tools (Charles, Proxyman, Fiddler).
• Basic knowledge of SQL or databases.
• Experience working in Agile / Scrum teams.
• Experience with test management tools (TestRail, Zephyr, Xray, or similar).
• Experience with mobile automation (Appium or similar) — as a plus.

What We Offer

• Relocation support to Madrid, Spain.
• Standard business hours.
• Opportunity to work on high-traffic applications.
• Collaborative team environment.
• Career advancement opportunities in QA & Testing.