Ngoc Anh Lien

QA Engineer with 2+ years of experience testing securities, fintech, and web/mobile products for Vietnamese and Korean clients. Experienced in functional, regression, API, integration, and cross-device testing, with strong hands-on skills in Postman, Swagger, SQL, and defect investigation. Experienced in working as the primary QA on projects, from requirement analysis and test case design to defect reporting, regression testing, and release validation.

Strong understanding of UI, API, and database interactions, with practical experience in performance and authorization testing.

QUALITY ASSURANCE ENGINEER at DIFISOFT VIETNAM JSC (2024-05 – 2026-08)

Delivered QA solutions for high-stakes securities, fintech, and enterprise platforms across Vietnam and Korea in cross-functional Agile teams (6–13 members including dedicated PMs/BAs). Acted as the sole QA across most assigned projects, regularly managing two complex projects concurrently. Within the first year, progressed from test case execution to handling requirement clarification with Korean clients through written communication and cross-reviewing test suites for junior QAs.

QA Engineer - KB COMMUNITY (QUANTIT, KOREA) at DIFISOFT VIETNAM JSC (2026-05 – 2026-08)

Served as the primary QA for a stock investor community integrated into KB Securities' M-able app.

• Designed and executed 500+ test cases and reported 198 defects across Mobile Web, Admin Web, API, and business logic.
• Tested APIs with Postman/Swagger and used SQL to verify database record and investigate defects across UI, API, and DB layers.
• Identified a paywall authorization issue allowing free-tier users to access paid content through certain notification and repost flows.

QA Engineer - BSC M-TRADER (BIDV SECURITIES) at DIFISOFT VIETNAM JSC (2025-07 – 2026-02)

Tested stock trading features including Login/OTP, Order Placement, Price Board, Portfolio, and Asset Management.

• Validated real-time market data and WebSocket streaming against third-party API data.
• Performed load testing with Loader.io, simulating up to 10,000 concurrent users on selected high-traffic APIs.
• Analyzed response times and system behavior and created test scenarios based on Vietnamese securities trading flows.

QA Engineer - SANXINHA (SHINHAN SECURITIES VIETNAM) at DIFISOFT VIETNAM JSC (2024-06 – 2025-08)

Co-owned UI/UX and functional testing for a complex, feature-rich securities trading mobile app over a 14-month delivery cycle. Communicated with the Korean product team in English on a daily basis through written communication for requirement validation and issue resolution.

QA Engineer - PAAVE at DIFISOFT VIETNAM JSC (2024-05 – 2026-08)

Tested mobile trading and Admin Web features including account management, transactions, and scheduled jobs.

• Used SQL to verify database records against UI and API results.
• Investigated issues related to business logic, date calculations, data consistency, and scheduled jobs.

QA Engineer - Trade X at Navisoft (2025-11 – 2026-03)

Tested derivatives trading features; collaborated with BAs to analyze complex financial derivative instruments and validate risk rules.

QA Engineer - Kiggle at Tudy (2025-12 – 2026-06)

Conducted full-scope testing across 3 roles (Admin / Tutor / Parent) for an edtech marketplace, covering scheduling, class management, and real-time in-app chat.

QA Engineer - GT8 at Unknown (2026-06 – 2026-08)

Tested construction management web platform focusing on RBAC and complex workflows. Utilized AI-assisted developer tools to investigate technical issues and submit minor bug fixes via Pull Requests under Tech Lead supervision.

Backend API Developer at Freelance (2024-08 – 2025-04)

PHENIKAA HOSPITAL MANAGEMENT SYSTEM — BACKEND API REBUILD

• Developed and rebuilt 20+ REST APIs based on existing UI requirements and database structures.
• Used Postman and SQL to validate API behavior and database record.
• Worked with relational data and SQL JOINs to support API requirements.
• Strengthened my understanding of the UI → API → database data flow, improving my ability to investigate API and integration defects as a QA.

Bachelor's Degree in Information Technology Engineering – University of Transport Technology (2020-08 – 2024-05)