Jonathan M.

Senior Functional QA Tester | Web, Mobile & Software Testing

Nice to meet you all, my name is Jonathan Mercado. I'm a Senior Functional QA Tester with 5+ years of experience testing web applications, mobile apps, desktop software, banking systems, e-commerce platforms, and video games. I've completed 1,500+ hours of QA work on Upwork, including long-term testing projects, and have worked with both startups and established companies across different industries. My main focus is Functional and Manual Testing. I test products from a real user's perspective, explore different scenarios and edge cases, and provide clear, reproducible bug reports that help development teams quickly understand and resolve issues. What I can help you with: • Functional & Manual Testing • Exploratory Testing • Regression & Smoke Testing • Web Application Testing • Mobile App Testing (iOS & Android) • Desktop Application Testing • Cross-Browser & Cross-Device Testing • UI/UX and Figma Validation • Payment & Checkout Flow Testing • Test Case Creation & Execution • Bug Reporting & Documentation • Release and Production Validation I've tested products across a variety of industries and environments, including: • E-commerce and subscription platforms • Banking and financial systems • Payment and checkout flows • Web and mobile applications • Desktop applications • Video games • Healthcare platforms • AI/LLM-based products I'm comfortable working with Jira, Azure DevOps, TestRail, Testiny, BrowserStack, Figma, Chrome DevTools, BugHerd, Postman, SoapUI, and SQL databases, among other QA tools. I also have working knowledge of API testing, accessibility testing, and test automation with Playwright/TypeScript. While these aren't my primary specialization, they allow me to investigate issues beyond the UI when needed. What you can expect from me: ✓ Clear and reproducible bug reports ✓ Detailed testing of both happy paths and edge cases ✓ Strong attention to functional and UI details ✓ Clear communication with developers, designers, and product teams ✓ Experience working independently and within established QA teams ✓ A practical, user-focused approach to software quality Whether you need someone for a one-time testing cycle, release validation, or long-term QA support, I can adapt to your existing workflow and help make sure your product works as expected before it reaches your users.