Ernesto Casillas
QA Engineer | Web, API & Mobile Testing
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Urban Grocers — Manual API Testing
Functional API testing for an urban grocery platform. Completed as part of TripleTen's QA Engineering program.
Executed GET, POST, PUT, and DELETE requests to validate authentication, business rules, inventory logic, and JSON response structure. Tested input validation, delivery restrictions, required fields, and HTTP status codes across positive and negative scenarios. Documented backend defects and business logic inconsistencies in Jira with full reproduction evidence.
Tools: Postman · Jira
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Automated API test suite for backend validation of a grocery platform. Completed as part of TripleTen's QA Engineering program.
Automated positive and negative test scenarios for user kit creation, validating field length restrictions, special characters, numeric strings, and error handling. Validated HTTP responses, required fields, and edge-case input behavior.
Tools: Python · Requests · Pytest · PyCharm · Git/GitHub
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Automated end-to-end test suite for a transportation web application. Completed as part of TripleTen's QA Engineering program.
Built automated E2E scenarios validating the complete taxi booking workflow using Selenium WebDriver and Python. Implemented Page Object Model (POM), XPath, CSS Selectors, and explicit waits to handle dynamic elements. Analyzed DOM structure via DevTools to improve selector reliability and test stability.
Tools: Python · Selenium WebDriver · Pytest · PyCharm · Git/GitHub · DevTools
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Manual, API, cross-browser, and Android mobile testing for a scooter rental platform. Completed as part of TripleTen's QA Engineering program.
Executed 100+ test cases covering order workflows, state transitions, and business logic. Tested REST API endpoints (GET, POST, PUT, DELETE) across positive and negative scenarios. Applied Boundary Value Analysis and Equivalence Partitioning for edge case validation. Performed cross-browser testing on Chrome and Opera, and mobile testing via Android Studio emulators. Documented all defects in Jira with reproduction steps, severity, and screenshots.
Tools: Postman · Jira · Android Studio · Chrome · Opera · DevTools
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