Sabine U.

ISTQB-Certified QA Engineer | Manual & Automation Testing (Playwright, Playwright MCP, Cypress, API, Performance, Full-Stack QA) I’m an ISTQB-certified QA Engineer with 6+ years of experience testing web, mobile, and API-based applications for startups and global remote companies. My approach blends manual & automated testing and AI to ensure your product is not just functional — but fast, scalable, and user-friendly. I help clients by: Creating robust automated test suites with Playwright, Playwright MCP, Cypress, and CodeceptJS Performing end-to-end manual testing (functional, regression, exploratory, usability) Conducting API testing with Postman & automated API checks in CI/CD Running performance & load tests using k6 & JMeter Designing test strategies based on ISTQB and ISO/IEC 25010 quality standards Writing clear, reproducible bug reports in Jira, Trello, or ClickUp and Defect Management Key Achievements: Reduced post-release bugs by 30% for a global SaaS company through automation coverage expansion Improved test execution time by 50% with optimized CI/CD integration Successfully worked 100% remote for 6 years, collaborating across US, EU, and African time zones Tech Stack & Tools: Automation: Playwright, Playwright MCP, Cypress, CodeceptJS, Selenium, Claude and ChatGPT Performance: k6, JMeter API Testing: Postman, REST Assured Databases: PostgreSQL, MySQL Others: Git, GitHub, GitHub Actions, CircleCI, Docker basics If you need a detail-oriented, proactive QA partner who can ensure quality from day one, let’s talk — I’ll help make your release bulletproof.