
Christina Lin
Verified Expert in Engineering
Quality Assurance Engineer and Developer
Vancouver, BC, Canada
Toptal member since March 6, 2018
Christina is a senior QA engineer with 10+ years of experience working at startups, large enterprises, and government organizations. She builds automation frameworks and integrates AI-driven testing solutions with Selenium, Appium, Cypress, RestAssured API, and GPT -3 Driver. She also brings strong manual testing expertise across web and mobile. She is a strong collaborator with a track record of improving release confidence and delivering high-quality results on remote teams.
Portfolio
Experience
- Quality Assurance (QA) - 14 years
- Web App Testing - 14 years
- QA Automation - 11 years
- Selenium WebDriver - 10 years
- Mobile App Testing - 8 years
- Appium - 7 years
- API Testing - 3 years
- AI Testing - 2 years
Preferred Environment
Windows, MacOS, .NET, Python, Java, Jira
The most amazing...
...project I've done was developing a test automation framework from the ground up. It helped reduce manual testing time from four days to one day!
Work Experience
QA Engineer
Yahoo!
- Analyzed business requirements, design documents, and created test cases for project milestones, integrating AI to help generate test cases.
- Performed manual testing on iOS and Android mobile apps for Yahoo Sports and Fantasy Sports. Participated in team bug bashes. Reported bugs and communicated with developers to reach a resolution.
- Monitored and fixed test automation build flakiness to ensure stability of test runs.
Senior Test Automation Engineer
Duolingo
- Implemented cross-platform automation frameworks for web, Android, and iOS applications using Selenium WebDriver, Cypress, and Appium.
- Scripted AI-generated automation tests using MobileBoost GPT driver.
- Conducted functional, regression, and exploratory testing across multiple browsers and devices to ensure a seamless end-user experience.
- Monitored CI/CD automation builds, triaged test failures, investigated root causes of failures, and reported results to stakeholders for timely defect resolution.
QA Automation Engineer
nCrypt
- Designed and implemented a Selenium-based automation framework in Java from scratch, ensuring test reusability and modularity.
- Automated high-value regression test cases for a crypto exchange platform, improving release validation speed by 70%.
- Delivered automation test coverage metrics and framework demos to the development team, strengthening visibility of QA efforts.
- Performed manual testing on nCrypt's bitcoin and bitcoin cash exchange web application.
Senior QA Automation Engineer
BCAA
- Built end-to-end regression automation suites with Selenium WebDriver and Java for a customer relationship management and insurance sales application, reducing manual testing overhead.
- Developed RESTful API automation using REST Assured to validate back-end services for the PIPA project.
- Performed manual, database, and iPhone testing to ensure quality consistency across customer-facing systems.
- Worked under Scrum methodology to increase the visibility of QA efforts in Scrum ceremonies.
Test Lead
Treasury Board of Canada Secretariat
- Created a test automation framework from scratch using Selenium WebDriver, JavaScript/Protractor, and Python for an intranet migration initiative for the Ontario government on a WordPress platform.
- Authored the Test Strategy document to outline testing approaches and align QA methodologies with business and technical requirements.
- Led testing efforts and provided QA training to junior testers.
- Created and executed web accessibility (WCAG 2.0) test cases.
Software Test Developer
Ecobee
- Developed automated tests for a web application that allowed users to configure Ecobee's WiFi-enabled thermostat.
- Maintained and troubleshot the automation environments.
- Monitored automation test results daily and fixed bugs as needed.
- Mentored junior automation testers on coding standards.
Test Automation Engineer
Carebook Health Technologies
- Developed C#-based Selenium WebDriver UI automation scripts for a SaaS preventative health management system.
- Mentored offshore QA testers on creating effective and maintainable test suites to provide maximum test coverage for different testing phases.
- Wrote performance test scripts using Visual Studio Web Performance Test.
- Performed functional, regression, web, and mobile testing on Carebook's SaaS platform.
- Analyzed functional specs, requirements, and workflow designs.
Senior QA Analyst
Western Union
- Analyzed business requirements, UI workflow, and database design to create and execute test cases on a transaction monitoring and alert management system for detecting money laundering patterns for regulatory compliance (PEP, Worldcheck, Dodd-Frank).
- Designed the test plan and test case templates and created the entire regression testing suite.
- Performed black box and white box functional, regression, integration, database, and UI testing.
- Configured HP Quality Center as a test management system for full traceability across requirements, tests, and defects.
- Provided test coverage and defect summary reports for project releases.
Test Lead
Provincial Health Services Authority
- Performed functional, integration, regression, security, and automated testing for a renal patient information management system used across BC renal clinics and hospitals.
- Managed a team of four testers, defined the scope of testing, planned and led project testing efforts, and established and standardized QA processes. Developed the test strategy. Participated in UAT planning and triaged user feedback.
- Evaluated, recommended, and coordinated the purchase and training of test management, requirements management, test automation, and bug-tracking tools. Set up and maintained all QA tools.
- Designed test plan, test case, and defect templates. Developed test estimations.
- Determined QA resource needs and participated in the QA hiring process.
Software Tester
The Active Network
- Analyzed functional specifications, created and executed test cases for Point of Sale (POS), payment transaction processing, and event registration systems.
- Tested the SQL encryption for payment data transmission from client to server using a Microsoft Network Monitor.
- Performed website accessibility testing for ADA compliance.
- Presented demos of new software features to stakeholders and customers.
- Collaborated with offshore developers and testers.
- Implemented hardware testing on cash drawers, receipt printers, validation printers, scanners, and webcams.
Software Developer
SAP Business Objects
- Added and modified installation features to the Business Objects Enterprise application on both Windows and Unix platforms.
- Developed installation features to support different language localizations.
- Developed installation features to support different types of databases.
Software Developer
Currenex
- Converted all of the embedded test code into JUnit test cases.
- Developed an administrator setup application using Java, JavaScript, Ajax, and SQL that allowed the superuser to add, edit, and delete administrators.
- Gathered the requirements, then developed the user interface design, and implemented both front-end and back-end code.
- Wrote SQL database queries and conducted unit and integration testing.
- Managed the integration into the main application.
- Added user group deletion, user filtering, and user search features to the existing application.
Software Engineer
MacDonald, Dettwiler, and Associates (MDA)
- Implemented classes in C++ to build a “bridge” to transport navigation aid data from the database to the front-end layers of the application.
- Developed backend code to deliver data to the UI layer.
- Developed backend code to deliver data to the UI layer.
Experience
Building the Entire Test Automation Framework at nCrypt
I automated all the critical and commonly-used workflows in the front-end web application, and the automation suite was run during regression testing period to reduce manual testing time and efforts. The QA team especially appreciated the fact that the automated tests replaced some of the most tedious and time-consuming manual test cases that involved number calculations and checking for the correct cash, bitcoin, and bitcoin cash balances in the customers' wallets within the application.
Building an API Test Suite to Test RESTful Web Services
After creating the testing framework and the initial set of test cases, I mentored another tester on REST services and the programming syntax for writing API tests. The project was a success, and the entire test suite was run on a daily basis in Bamboo, our continuous integration tool.
Leading the QA Activities for a Brand-new Government Agile Project
After some discussions with the development team, we decided to build the test automation project in Python because it was the language that the majority of the developers was comfortable with. I built the test automation framework from scratch using Selenium WebDriver and automated the tests for all the new features that the developers produced in each sprint.
In addition to building the entire test automation framework, I also mentored junior testers, set up, and configured test management and defect tracking systems, performed accessibility testing for the hearing-impaired, and created the test strategy document for submission to the senior management.
The Agile project we worked on served as a pioneering example for other departments within the organization, and we frequently had colleagues visit our office to learn how we used the Agile methodology to deliver our project incrementally and successfully.
Serving as a Mentor in UBC's Computer Science Mentorship Program
Education
Bachelor's Degree in Computer Science
The University of British Columbia - Vancouver, BC, Canada
Skills
Libraries/APIs
Selenium API, Selenium WebDriver, WebDriver, REST APIs, Playwright, Node.js, React
Tools
Confluence, Subversion (SVN), REST Assured, Microsoft Test Manager, TestRail, HP Quality Center (QC), Eclipse IDE, Jira, Cucumber, Zephyr, Postman, TortoiseSVN, TortoiseGit, Bitbucket, Jenkins, Microsoft Visual Studio, Git, Apache Maven, Microsoft Team Foundation Server, Phabricator, GitLab, GitHub, BrowserStack, Trello, VersionOne, Visual Studio, TFS, QTP, IE Developer Toolbar, pgAdmin, Perforce, HP QuickTest Professional (QTP), Bamboo, Xcode, Android Auto, Charles Proxy
Languages
XPath, Java, Python, CSS, Python 3, JavaScript, HTML, SQL, XML, TypeScript, C++, C#, C#.NET, Swift
Frameworks
Selenium, JUnit, TestNG, Appium, Protractor, Jasmine, XCUITest, Cypress, Swagger, NUnit, .NET
Paradigms
Software Testing, Functional Testing, Unit Testing, E2E Testing, Scrum, Testing, Automated Testing, Test Automation, Manual Testing, Agile, Automation, User Acceptance Testing (UAT), User Testing
Platforms
Android, iOS, TestLink, MacOS, Windows, WordPress, Oracle Database, Salesforce
Storage
Databases, Microsoft SQL Server, JSON, SQL Server Management Studio (SSMS)
Other
QA Testing, Web Service Testing, Test Automation Frameworks, Smoke Testing, White Box Testing, Regression Testing, Automated UI Testing, UI Testing, Integration Testing, System Testing, Exploratory Testing, Test Case Execution, Test Case Creation, Test Planning, Software Testing Lifecycle (STLC), Test Management, Android Testing, Test Analysis, Selenium PageFactory, Website QA, QA Leadership, Agile Software Testing, Website Testing, Web App Testing, Web-based Testing, Black Box Testing, Manual QA, Mobile App Testing, UI Automation, QA Automation, Software QA, Software Development Lifecycle (SDLC), Quality Assurance (QA), Test Cases, Selenium Page Object, Mobile Device QA Automation, SDET, Software Development, Mobile Apps, Leadership, Test Scripting, Test Scenarios, Agile QA, Testing Strategy, Cross-browser Testing, Manual Software Testing, Bug Discovery & Tracking, Documentation, Startups, Quality Control (QC), Test Documentation, QA Process, Validation, Web Accessibility, Team Foundation Server 2013, API Testing, APIs, CI/CD Pipelines, Accessibility Testing, Content Management Systems (CMS), Mandarin, Artificial Intelligence (AI), Data Migration Testing, Data Annotation, Data Labeling, AI Testing, PyUnit, Wave, Accessibility, JAWS, IIS, Cryptocurrency, Log4j, Agile Sprints, Fantasy Sports, Sports
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