Сергій

Sergiy Subotin
Manual QA Engineer
Phone: [open contact info](look above in the "contact info" section) (Telegram) | Email: [open contact info](look above in the "contact info" section)
LinkedIn: [open contact info](look above in the "contact info" section)
Location: Ukraine, Remote

SUMMARY
Manual QA Engineer with 4+ years of experience testing web, mobile, and desktop products across functional, regression,
integration, and end-to-end testing. Built and shipped an automated n8n workflow that uses AI to generate detailed test cases,
cutting creation time by ~65% (from ~2 hours to ~40 minutes) while keeping a manual QA approval gate — one of several
ways I bring AI tooling into day-to-day QA without giving up manual rigor. Currently expanding into automation testing
(Playwright, JavaScript) to grow into a hybrid Manual/AQA role. I go beyond the happy path: questioning unclear
requirements, digging into edge cases, and verifying how a product actually behaves under real conditions.

EXPERIENCE

Manual QA Engineer | Software Development Hub | February 2022 – Present | EdTech
• Own end-to-end QA for Roster Sources (EdTech platform): test documentation, regression and smoke suites, and release
validation across UI and API layers (Swagger, Postman), covering a feature-driven release cadence rather than fixed
sprints.
• Identified, documented, and tracked 300+ bugs over 2 years in Jira with clear repro steps — ~10% flagged critical during
local testing, with only ~3% escaping into the main branch.
• Collaborated closely with developers and BAs to clarify ambiguous requirements and validate reworks before release,
reducing miscommunication-driven defects.
• Performed accessibility testing (AXE DevTools) and database validation (PostgreSQL) as part of end-to-end release
checks.
• Onboarded 5 new team members (QA, developers, BAs, PMs) through focused ~2-hour product walkthroughs, becoming
a go-to resource for product knowledge on the team.
Software Tester | Joyn — pet project (unpaid) | November 2021 | Streaming Platform
• Wrote test plans and broke down requirements into manageable test scope.
• Created and executed test runs and test cases in TestRail.
• Logged and tracked bugs in Jira.

QC Specialist | "Import Office Ukraine" LTD | September 2020 – February 2021 | E-commerce
• Checked incoming goods against purchase orders for quality and quantity discrepancies.
• Identified and corrected processing errors before goods were logged as received.
• Documented and tracked issues in Excel-based bug/error logs.

TECHNICAL SKILLS
Web testing: Functional, Regression, Integration, E2E, Exploratory, Smoke, API testing
Mobile testing: iOS, Android, BrowserStack
Domains: EdTech, Media Streaming, E-Commerce
API & Backend: REST API, JSON, Swagger/OpenAPI, Webhooks, PostgreSQL
Tools: Jira, Confluence, Jenkins, TestRail, Sentry, Chrome DevTools, AXE DevTools
AI-assisted QA: n8n workflow automation, ChatGPT, Claude, prompt engineering
English: Intermediate, working proficiency

EDUCATION
Master's Degree, Engineer-Technologist
Kyiv Trade and Economic University — 1999–2004

COURSES
robot_dreams — AI Tools for Testing (21 study hours, 15 lessons), 2026
• Built an automated AI test-case generation pipeline in n8n, streamlining test-case creation while maintaining a manual
QA approval gate.
• Applied AI/LLM tools (ChatGPT, Claude) to generate test cases, checklists, and QA documentation.

• Built a reusable prompt library for QA tasks using few-shot, prompt chaining, and meta-prompting techniques.
• Established QA practices for AI outputs: hallucination detection, response verification, and A/B testing of prompts.
• Used AI for API testing (Postman AI, Swagger/OpenAPI analysis) and SQL test-data generation (DBeaver AI).
• Performed AI-assisted non-functional testing: accessibility (AXE DevTools AI), performance, and usability review.
• Applied AI security-testing fundamentals, including OWASP Top 10 for LLMs and prompt-injection risk assessment.
Mate Academy — QA course (full-time, 3 months), 2021
• QA basics/theory, SQL basics, Git and terminal, JavaScript basics, HTML/CSS basics.
• Web application testing, mobile testing, QA ethics.