Vitalii

Vitalii Kostianets
[відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») Kyiv, Ukraine
PROFESSIONAL SUMMARY

QA Engineer with hands-on experience in manual testing of mobile and client-server products at Samsung R&D Institute
Ukraine. Tests new functionality and runs regression on many devices, writes clear bug reports and verifies fixes, and
maintains test documentation - checklists and test cases. Understands HTTP and client-server interaction: inspects
requests and traffic with DevTools, Fiddler and Wireshark, tests REST APIs with Postman and validates data with SQL.
Works closely with developers and project stakeholders in Jira. ISTQB certified. B2 English.
CORE COMPETENCIES

Manual Testing Regression Testing Bug Reports Checklists & Test Cases HTTP / Client-Server DevTools

API Testing (Postman) SQL Field Testing

PROFESSIONAL EXPERIENCE

Samsung R&D Institute Ukraine Kyiv, Ukraine

Research Development Software Engineer - Visual Intelligence Lab
08.2025 - 12.2025
Researched computer vision and AI models; prototyped a graphic solution based on AI models using Python
Evaluated AI model output quality: accuracy, false positive/negative rates, edge cases

Samsung R&D Institute Ukraine Kyiv, Ukraine

Senior QA Engineer / QA Lead - Mobile QA Lab
06.2017 - 06.2025
Tested new functionality and ran regression testing for the Ukrainian market release of all Samsung mobile devices
and applications
Found, described and verified fixes for defects: 1,000+ bug reports filed personally in Jira, >65% modification rate, <1
day average turnaround
Created and maintained test documentation - a 5,000+ test case repository with check-lists, test cases, traceability and
reporting
Analyzed HTTP requests, client-server traffic and logs with Fiddler, Wireshark and ADB for root cause analysis
Tested REST APIs with Postman and Swagger and validated data with SQL queries
Analyzed requirements and acceptance criteria and planned testing across the full SDLC
Tested 3G, 4G/5G, VoLTE and VoWiFi launches with Kyivstar, Vodafone Ukraine and lifecell - voice and data call
testing, field testing
Reached 40% automation coverage together with developers and SDETs
Worked in Agile (Scrum) teams with developers, product teams and stakeholders in Korea, India and Poland

Samsung R&D Institute Ukraine Kyiv, Ukraine

Mobile QA Engineer - Mobile QA Lab
07.2014 - 05.2017
Performed functional, integration and field testing of embedded mobile devices
Designed and executed test cases and scenarios; captured logs and tracked defects in Jira
Cooperated with international teams (Korea, India, Poland)

KEY ACHIEVEMENTS

1,000+ bugs filed personally, with a modification rate >65% and average turnaround <1 day
Built and maintained a 5,000+ test case repository with traceability and reporting
Tested 3G/4G/5G, VoLTE and VoWiFi launches with all three Ukrainian mobile operators
40% automation coverage achieved through collaboration with developers and SDETs

EDUCATION

National Technical University of Ukraine "Kyiv Polytechnic Institute" - Specialist Degree, Radio Engineering 2004 - 2010

CERTIFICATIONS

ISTQB Certified Tester Foundation Level 2021

ISTQB Certified Tester Advanced Level - Test Manager 2022

ISTQB Certified Tester Mobile Application Testing 2024

SKILLS

QA & Testing: Manual testing, new functionality testing, regression, functional, integration and exploratory testing, multi-device
testing, bug reports and fix verification, checklists, test cases, test documentation, requirements analysis
API & Data: HTTP and client-server interaction, REST API testing (Postman, Swagger), SQL queries, traffic and log analysis
Telecom & Voice: 3G, 4G/5G, VoLTE, VoWiFi call testing, RF and protocol compliance, field testing with operators, network
troubleshooting
Tools: Jira, Confluence, TestRail, Postman, Swagger, DevTools, Fiddler, Wireshark, Git, GitHub, Unix/Linux CLI, ADB, Python
Process & AI: Agile (Scrum), sprint-based delivery; AI assistants: Claude, Cline
LANGUAGES

Ukrainian - Native English - Upper Intermediate (B2)