Всеволод

VSEVOLOD KOSIAK
Kyiv, Ukraine
• Telegram • LinkedIn • [открыть контакты](см. выше в блоке «контактная информация»)

SUMMARY
QA Engineer with 3+ years of commercial experience in manual testing of native iOS and Android
applications and web-based admin panels. Experienced in testing hardware-integrated IoT mobile
products, including device connectivity, data exchange, and client-server interactions. Strong in
functional and regression testing, test documentation, API, and network traffic analysis (Charles
Proxy), and data validation at the database level (PostgreSQL). Contributed to internal
documentation and supported the onboarding of new QA team members.

WORK EXPERIENCE
QA Engineer, TrackEnsure Inc. Nov 2022 - Jan 2026

Project: Native iOS and Android mobile application integrated with ELD IoT devices for managing
drivers’ electronic logbooks and HOS-related data

Executed comprehensive manual testing of native iOS and Android applications, ensuring
stable functionality and smooth user experience.
Maintained structured test documentation (checklists, test cases, bug reports), ensuring
transparency and consistency of QA processes.
Analyzed client-server API interactions using Charles Proxy and Postman to debug
synchronization issues and verify data payloads.
Conducted functional, regression, and retesting activities for a production system,
supporting application stability and compliance with HOS/ELD industry regulations.
Performed backend data validation using SQL (PostgreSQL) to ensure data consistency
across devices and servers.
Validated web-based admin panels and back-office systems supporting mobile applications
Authored detailed internal wiki articles to enhance team collaboration, streamline workflows,
and promote knowledge sharing (Redmine).
Supported the onboarding of new team members, facilitating faster adaptation and
knowledge transfer.

SKILLS
Manual testing of mobile (iOS / Android) and web applications
Testing of hardware-integrated IoT products
Functional, regression, integration testing in production environments
Test design and structured test documentation
Client–server architecture and data flow analysis
API and network traffic debugging
Data validation using SQL (PostgreSQL)

TOOLS
Redmine, Jira, TestRail
Charles Proxy, Postman
DataGrip, Chrome DevTools
EDUCATION
Ladyzhyn College Vinnytsia National Agrarian University Sep 2016 - Jun 2020
Junior Specialist, Technician Electrician

ADDITIONAL EDUCATION
Mate Academy Mar 2022 - Aug 2022
QA Manual with automation basics

LANGUAGES
Ukrainian (Native)
English (Intermediate)