Сергій

SERGII SHERSHNOV
SENIOR QA ENGINEER | PYTHON AUTOMATION | API & PERFORMANCE TESTING
📍 Remote / Ukraine 📞 [відкрити контакти](див. вище в блоці «контактна інформація») ✉️ [відкрити контакти](див. вище в блоці «контактна інформація») 🔗 [відкрити контакти](див. вище в блоці «контактна інформація»)
PROFESSIONAL SUMMARY
Senior QA Engineer with 7+ years of hands-on experience in manual and automated testing of web, mobile, desktop,
backend, and hardware-integrated systems. Strong expertise in Python test automation, API testing, asynchronous
execution, performance testing, database validation, and CI/CD integration. Proven track record of taking end-to-end
ownership of QA workflows—from test planning and execution to defect analysis and release readiness. Currently
acting as sole QA Engineer in a healthcare startup, combining test automation with modern AI-assisted engineering
workflows (Cline, OpenAI APIs) to accelerate testing cycles and log analysis.
CORE EXPERTISE
Automation: Python, Pytest, Playwright, Selenium WebDriver, Behave
API & Performance: httpx, Requests, Postman, Swagger, SoapUI, Locust (Load Testing)
Databases: PostgreSQL, MySQL, DB2
CI/CD & DevOps: Jenkins, GitHub Actions, GitLab CI, Docker, Git
AI & Modern Tech: Cline, OpenAI APIs, AI-Assisted Test Generation & Log Analysis
Tools & Tracking: Jira, Allure, DevTools, Fiddler, Sentry, Datadog, PyCharm, VS Code
Testing Scope: Functional, Integration, Regression, Exploratory, UI, Cross-Browser
PROFESSIONAL EXPERIENCE
Senior QA Engineer | Healthcare Startup 09/2025 – Present
Remote • Sole QA Engineer responsible for end-to-end quality delivery of a fast-paced healthcare product.
Own the full QA lifecycle: test planning, risk assessment, execution, defect analysis, and release readiness.
Design and maintain API automation frameworks using Python, Pytest, and httpx with asynchronous testing.
Leverage Cline and OpenAI APIs to accelerate test script development, analyze logs, and troubleshoot issues.
Execute Locust load and performance tests to evaluate backend stability and concurrent traffic behavior.
Validate backend integrity using PostgreSQL queries and integrate automated tests into Jenkins pipelines.
Senior QA Engineer | Freelance 09/2023 – 08/2025
Remote • SaaS and product development projects (including BulkSource / AMTOSS, Ltd.)
Developed UI and API automation test suites using Python, Pytest, Playwright, httpx, and Postman.
Designed and executed Locust performance tests; performed cross-browser and platform validation.
Integrated automated test pipelines into Jenkins, GitHub Actions, and GitLab CI.

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Middle QA Engineer | AMTOSS, Ltd. 03/2022 – 07/2023
Remote • SaaS Logistics & Desktop Solutions
Analyzed business requirements and translated them into test cases, checklists, and acceptance criteria.
Developed UI automation test suites using Python, Behave, and Selenium WebDriver.
Performed API, functional, integration, and regression testing for web and desktop applications.
Investigated complex defects, reproduced customer issues, and collaborated with Agile development teams.
Middle QA Engineer | Plan A 04/2021 – 03/2022
Remote • Key Project: FabiTrack / FabiCash (Gaming & Payment Solutions)
Conducted end-to-end testing of web applications interacting with hardware devices and external payment terminals.
Automated positive and negative test scenarios using Python (Behave, Playwright) and API tools (Postman, Requests).
Validated backend database interactions and data flows using PostgreSQL and Docker environments.
Middle QA Engineer | Business Process Technology 08/2019 – 04/2021
Ukraine • IoT & Health-tech Systems
Tested complex API integrations between web/mobile applications and diagnostic IoT/healthcare devices.
Created and executed automated performance and load tests using Python and Locust.
Automated backend API requests and managed defect tracking in Jira.
Junior QA Engineer | Software Development Hub LLC 02/2019 – 06/2019
Ukraine • Web Software Development
Executed manual functional and regression test scripts for various web client applications.
Created test cases, tracked defects in Jira, and collaborated closely with developers.
EDUCATION & PROFESSIONAL DEVELOPMENT
Kharkiv National Academy of Municipal Economy — Specialist Degree (Architecture & Urban Planning) 2003 – 2009
QA Automation Course — OTUS 2020
QA Manual Course — QATestLab 2019
Full Stack Web Development — Posterum 2016
LANGUAGES
Ukrainian: Native | Russian: Native | Polish: Advanced | English: Intermediate

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