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I am an ISTQB certified Senior QA Engineer with 15+ years of experience delivering high-quality SaaS, web-based, and AI-driven systems. I've built QA processes and automation frameworks in fast-paced startups, mentored small teams, and collaborated closely with engineering and product to ensure reliable releases. I champion shift-left testing, review requirements early, design comprehensive test plans, and identify risks before they become defects. I balance manual and automated testing, foster a quality-first mindset, and help teams ship stable products even under tight deadlines. I thrive in cross-functional teams and love optimizing SDLC quality through data-driven testing, clear defect management, and proactive risk assessment. Fluent in English and comfortable working remotely across time zones.…I am an ISTQB certified Senior QA Engineer with 15+ years of experience delivering high-quality SaaS, web-based, and AI-driven systems. I've built QA processes and automation frameworks in fast-paced startups, mentored small teams, and collaborated closely with engineering and product to ensure reliable releases. I champion shift-left testing, review requirements early, design comprehensive test plans, and identify risks before they become defects. I balance manual and automated testing, foster a quality-first mindset, and help teams ship stable products even under tight deadlines. I thrive in cross-functional teams and love optimizing SDLC quality through data-driven testing, clear defect management, and proactive risk assessment. Fluent in English and comfortable working remotely across time zones.

Cao Thi Tuyet Nhung

QA Engineer, Web Developer, Developer, +3

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I am an ISTQB certified Senior QA Engineer with 15+ years of experience delivering high-quality SaaS, web-based, and AI-driven systems. I've built QA processes and automation frameworks in fast-paced startups, mentored small teams, and collaborated closely with engineering and product to ensure reliable releases. I champion shift-left testing, review requirements early, design comprehensive test plans, and identify risks before they become defects. I balance manual and automated testing, foster a quality-first mindset, and help teams ship stable products even under tight deadlines. I thrive in cross-functional teams and love optimizing SDLC quality through data-driven testing, clear defect management, and proactive risk assessment. Fluent in English and comfortable working remotely across time zones.…I am an ISTQB certified Senior QA Engineer with 15+ years of experience delivering high-quality SaaS, web-based, and AI-driven systems. I've built QA processes and automation frameworks in fast-paced startups, mentored small teams, and collaborated closely with engineering and product to ensure reliable releases. I champion shift-left testing, review requirements early, design comprehensive test plans, and identify risks before they become defects. I balance manual and automated testing, foster a quality-first mindset, and help teams ship stable products even under tight deadlines. I thrive in cross-functional teams and love optimizing SDLC quality through data-driven testing, clear defect management, and proactive risk assessment. Fluent in English and comfortable working remotely across time zones.

Available to hire

I am an ISTQB certified Senior QA Engineer with 15+ years of experience delivering high-quality SaaS, web-based, and AI-driven systems. I’ve built QA processes and automation frameworks in fast-paced startups, mentored small teams, and collaborated closely with engineering and product to ensure reliable releases. I champion shift-left testing, review requirements early, design comprehensive test plans, and identify risks before they become defects. I balance manual and automated testing, foster a quality-first mindset, and help teams ship stable products even under tight deadlines.

I thrive in cross-functional teams and love optimizing SDLC quality through data-driven testing, clear defect management, and proactive risk assessment. Fluent in English and comfortable working remotely across time zones.

Skills

Experience Level

Expert

Expert

Expert

Expert

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Expert

Expert

Expert

Expert

Expert

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Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Work Experience

Senior Software QA Engineer at Freelancer

September 1, 2019 - Present

Analyzed business requirements and functional specifications to ensure complete test coverage. Designed test cases and executed tests across multiple environments. Conducted API/GraphQL API testing using Postman; verified API responses against databases; ensured consistency across multi-layered services and end-to-end workflows. Identified and investigated bugs by analyzing logs and services, documenting reproduction steps, and suggesting potential solutions. Developed and maintained UI automation with Selenium and Cypress. Supported team members by reviewing test cases and mentoring new members. Provided detailed bug reports and test summary reports.

Senior Quality Control Engineer at Harveynash Vietnam

July 1, 2014 - August 1, 2019

Analyzed business requirements and clarified them with customers and the BA team. Designed and executed test strategies, plans, scenarios, and checklists. Performed Smoke, Functional, Integration, GUI, Database, Localization, Cross-Browser, and Regression Testing on QA and UAT environments. Conducted REST API testing using Postman and SOAP API testing using SOAPUI. Verified change requests, tracked defects, and provided bug reports, test reports, and sprint summaries. Worked on-site at the UK customer’s headquarters for one month to facilitate product handover and knowledge transfer. Mentored and trained QA team members; led a QA team of 3–5 members following Scrum processes. Collaborated closely with developers and business analysts to clarify requirements and resolve issues.

Software Testing Engineer at GrapeCity Vietnam

July 1, 2009 - May 1, 2014

Worked on a project that develops a spreadsheet component for Visual Studio .NET. Performed requirement analysis. Documented test cases and conducted peer reviews. Executed tests across various environments. Wrote automation test scripts for general features using C# on Telerik Testing Framework. Performed smoke testing and installation tests. Prepared daily test execution and bug reports.

Software Developer at FPT Software

September 1, 2006 - May 1, 2009

Worked on a project that develops and maintains car navigation embedded software. Collaborated with customers to clarify requirements. Created detailed feature designs and performed peer reviews. Implemented features using C and C#. Performed unit testing. Prepared summary reports.

Senior Software Testing Engineer at Cognni Israel

November 1, 2020 - October 1, 2025

Analyzed business requirements and functional specifications to ensure complete test coverage. Designed and maintained test cases and test data for sprint user stories. Executed tests across multiple environments, including API and frontend validations. Performed API testing using Postman; verified API responses against databases, ensured consistency across multi-layered services, and validated end-to-end workflows. Conducted GraphQL API testing and automated validation of core queries using Jest Snapshots. Implemented and maintained Selenium-based frontend regression tests. Identified and investigated bugs by analyzing logs and services, documenting reproduction steps, and proposing solutions. Delivered detailed bug reports and test summary reports, and mentored junior QA members for onboarding.

Software Testing Engineer at Upwork

December 1, 2025 - Present

Designed and executed test cases based on business requirements with a focus on data flows and dashboard validation; performed functional and regression testing on web dashboards; validated data accuracy and consistency between integrated data sources and displayed metrics; conducted API testing using Postman and verified responses; reported and tracked defects, collaborating with developers to resolve data and UI issues.

Senior Software Testing Engineer at Cognni Israel (remote)

November 1, 2020 - October 1, 2025

Defined lightweight QA process; analyzed business requirements and functional specifications to ensure coverage; designed and maintained test cases and data for each sprint; executed testing across multiple environments; conducted API testing (Postman) and GraphQL testing; built and maintained Selenium automation for frontend regression; investigated defects, documented reproduction steps, and produced detailed bug reports and test summaries; mentored new QA engineers.