Cesar Rosales, Developer in Mexico City, Mexico
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Cesar Rosales

QA Automation Engineer and Developer

Mexico City, Mexico

Toptal member since October 24, 2025

Expertise
Quality Assurance EngineeringAPITest AutomationNode.jsTypeScriptDockerSQLJavaScriptGitHubSeleniumJavaRuby
Bio

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

Paylocity
Playwright, Cypress, Manual QA
Solera
Cypress, Selenium, GitLab CI/CD, GitHub, Apache JMeter, Quality Assurance (QA)...

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

2025 - 2026
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.
Technologies: Playwright, Cypress, Manual QA

Software Development Engineer in Test II

2023 - 2025
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.
Technologies: Cypress, Selenium, GitLab CI/CD, GitHub, Apache JMeter, Quality Assurance (QA), Automated Testing, CI/CD Pipelines, AI Tools, Integration Testing, Cursor AI, Claude, Appium, Mobile App Testing, TypeScript, Test Automation, AI-generated Code, QA Automation, API Testing, Docker, SQL, Agile QA, QA Testing, Software QA, Manual Testing, Functional Testing, APIs, Node.js, Web App Testing, Manual QA, Regression Testing, iPhone

Experience

Finera Application

Designed and implemented a Flutter automation framework from the ground up for an iOS application, which has since been successfully released on the App Store. As part of my SDET responsibilities, I implemented unique widget locators to improve element identification reliability and reduce flakiness, resulting in more stable and efficient automated test execution.

Fleet Web App (Solera-Spireon)

• Conducted manual device testing and UI web automation testing for the fleet software application to ensure functionality and user experience.
• 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

2018 - 2023

Bachelor's Degree in Computer Science

National Polytechnic Institute - Mexico City, Mexico

Skills

Libraries/APIs

Node.js, Playwright

Tools

GitLab CI/CD, GitHub, Claude, Apache JMeter, Postman

Frameworks

Cypress, Appium, Selenium, Flutter

Paradigms

Automated Testing, Test Automation, Manual Testing, Functional Testing

Languages

JavaScript, TypeScript, SQL, Ruby, Java

Platforms

Docker

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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