Denys

Denys
Email: [відкрити контакти](див. вище в блоці «контактна інформація»)
GitHub: https://github.com/denuntren

OBJECTIVE
Junior QA Engineer (API & UI Automation) focused on backend systems, REST APIs, and
automated testing using Playwright. Strong understanding of HTTP, JWT authentication, database
validation, and system integrity.

TECHNICAL SKILLS

• REST API testing (positive & negative scenarios)
• HTTP status code validation (200, 201, 400, 401, 403, 404, 409)
• Swagger / OpenAPI contract validation
• Idempotency & retry behavior testing
• Transaction integrity validation
• Concurrency & race condition testing
• Broken Access Control & IDOR detection
• Playwright (TypeScript) – End-to-End UI automation
• JWT authentication validation via localStorage
• storageState-based session reuse
• Network assertions (waitForResponse, Promise.all pattern)
• Protected route validation (authorized vs unauthorized flows)
• Postman (Collections, scripts, Collection Runner)
• SQL (JOIN, GROUP BY, HAVING, SUM, COUNT, NULL handling)
• PostgreSQL, MongoDB
• Git
• C# / ASP.NET Core backend architecture understanding

PROJECT EXPERIENCE

Order System (GitHub)
https://github.com/denuntren/OrderSystem

• Developed and tested REST APIs built with ASP.NET Core.
• Validated business logic, transaction behavior, and database consistency.
• Identified race conditions and idempotency issues.
• Detected and documented IDOR (Broken Access Control) vulnerabilities.
• Implemented Playwright E2E automation suite:
• - Automated UI login flow with JWT validation
• - Captured and asserted /api/Auth/login network responses
• - Validated token persistence in localStorage
• - Implemented storageState session reuse
• - Tested protected routes (authorized vs unauthorized access)
• - Verified redirect behavior and UI state consistency
EDUCATION
3rd-year Computer Science student, Igor Sikorsky Kyiv Polytechnic Institute (2023–2027)

ENGLISH
B1–B2 (Intermediate)