Cesar Rosales
Verified Expert in Engineering
QA Automation Engineer and Developer
Mexico City, Mexico
Toptal member since October 24, 2025
Cesar is a QA automation engineer with experience in release management and regression testing. Highly skilled in Cypress, proficient in Selenium (Java) and Playwright, he has working knowledge of Ruby-based Selenium automation. With his extensive experience in the iOS Flutter automation framework, Cesar will be a valuable addition to any team.
Portfolio
Experience
- GitLab CI/CD - 2 years
- Selenium - 2 years
- GitHub - 2 years
- Cypress - 2 years
- Flutter - 1 year
- Playwright - 1 year
- Ruby - 1 year
- Apache JMeter - 1 year
Preferred Environment
Cypress, Playwright, Selenium, Ruby
The most amazing...
...thing I've developed from scratch is an iOS app automation framework in Flutter.
Work Experience
Senior Software Test Engineer
Paylocity
- Built and maintained automation tests for end-to-end flows, including handling dynamic tables, pagination, and data validation across multiple pages.
- Contributed to improving test stability by optimizing selectors and reducing flaky tests, and integrated the suite into CI/CD pipelines (GitLab and Sauce Labs) with parallel execution.
- Implemented API interception to validate back-end responses, worked with date inputs and complex form interactions, and ensured UI changes were properly validated.
Software Development Engineer in Test II
Solera
- Developed and implemented a maintenance plan for CI/CD pipelines of existing Cypress and Selenium repositories, resulting in a 40% timing improvement in the pipelines after maintenance.
- Created comprehensive test plans for a new software and services implemented for the fleet app, collaborating with stakeholders to define test scope and acceptance criteria, which resulted in a 15% reduction in post-release defects.
- Created a new Cypress framework from zero, including CI/CD integration, speeding up to 50% the time of regression testing.
- Enhanced personal testing skills by completing the ISTQB Foundation Level course.
- Advanced English proficiency and collaborated with teams based in the USA.
Experience
Finera Application
Fleet Web App (Solera-Spireon)
• Developed, maintained, and executed automation scripts using Cypress and Java Selenium, focusing on regression and confirmation testing.
• Performed black-box testing to validate application behavior against requirements.
• Supported CI/CD pipelines to integrate automated tests and ensure smooth delivery of releases.
• Conducted API performance testing using JMeter and validated APIs with Postman.
• Wrote and maintained automation scripts in JavaScript to enhance testing frameworks and coverage.
Education
Bachelor's Degree in Computer Science
National Polytechnic Institute - Mexico City, Mexico
Skills
Libraries/APIs
Node.js, Playwright, REST APIs
Tools
GitLab CI/CD, GitHub, Claude, Apache JMeter, Postman
Frameworks
Cypress, Appium, React Native, Selenium, Flutter
Paradigms
Automated Testing, Test Automation, Manual Testing, Functional Testing
Languages
JavaScript, TypeScript, SQL, Ruby, Java
Platforms
Docker, Mobile
Other
Quality Assurance (QA), QA Automation, API Testing, Agile QA, QA Testing, Software QA, APIs, Web App Testing, Manual QA, Regression Testing, CI/CD Pipelines, AI Tools, Integration Testing, Cursor AI, Mobile App Testing, AI-generated Code, iPhone, Data Science, Research & Investigation, ISTQB, Epic Systems
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