Денис

DENYS KOZYR
QA Engineer
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
QA Engineer with 6+ years of experience delivering release-ready web and mobile products across iGaming, FinTech/payment
flows, logistics, healthcare, and insurance domains. Strong in REST API testing, SQL/database validation, payment and
transaction flow testing, log analysis, defect isolation, regression strategy, smoke testing, deployment verification, and post-
release monitoring. Proven record of increasing test coverage by 30%, reducing production bugs by 20%, and shortening
regression execution by 25% through risk-based testing, structured documentation, and close collaboration with developers,
product teams, casino/payment operators, and stakeholders. Focused on validating critical business logic, improving release
confidence, and supporting stable production delivery.

CORE SKILLS
Testing: Functional Testing, Regression Testing, Smoke Testing, Exploratory Testing, End-to-End Testing, Web Testing, Mobile
Testing, Android, iOS, Cross-Browser Testing, UAT Support, Release Validation, Post-Release Monitoring
API and Data: REST API Testing, Postman, Swagger, OpenAPI, SQL, Database Validation, Data Consistency Checks,
Transaction Status Validation, Test Data Preparation
Logs and Monitoring: Datadog, Grafana, Kibana, Mouseflow, log analysis, defect isolation, production issue investigation
Tools: Jira, Confluence, TestRail, Zephyr, GitLab, Postman, Swagger, Figma, DBeaver, BrowserStack
Domains: Payments, FinTech, iGaming, Casino Operators, Bonus Mechanics, Affiliate Flows, Bank Transfers, Cryptocurrency
Transactions, Back-Office Systems, Integrations, SaaS, Healthcare, Insurance, Logistics
QA Leadership: Test Documentation, Regression Strategy, Risk-Based Testing, Mentoring, Onboarding, Knowledge Sharing,
Process Improvement, Release Readiness
AI-Assisted QA: ChatGPT, Codex, JamAI, Manus for test design, checklist generation, scenario expansion, bug analysis,
documentation support, automated test creation and maintenance, and repetitive QA workflow acceleration

PROFESSIONAL EXPERIENCE
TrueGroup - QA Engineer | Dec 2025 - Present
 Perform end-to-end testing of web and mobile iGaming products, validating critical user journeys, integrations, business rules,
and release stability.
 Work with casino operators to verify configurations, game availability, content setup, back-office behavior, and production-
sensitive scenarios.
 Validate bonus mechanics, affiliate flows, payment services, transaction flows, bank transfers, cryptocurrency operations,
statuses, limits, and user-facing calculations.
 Test REST APIs and data consistency using Postman, Swagger/OpenAPI, SQL, logs, and database checks; collaborate with
developers and product teams to isolate defects.
 Execute functional, regression, smoke, deployment, and post-release validation for high-risk features and product releases.
 Use Datadog, Grafana, Kibana, and database validation to support troubleshooting, defect analysis, and release confidence.
SPRIBE - QA Engineer | May 2022 - Nov 2025
 Tested web and mobile applications for global gambling operators on Android and iOS platforms, ensuring stable release
quality across business-critical flows.
 Created and maintained test documentation, checklists, test scenarios, and regression coverage for product features,
operator flows, and user-facing functionality.
 Conducted functional, regression, usability, API-related, and release validation testing to support reliable feature delivery and
product improvements.
 Owned complex and critical areas, using logs, analytics, and cross-team collaboration to investigate issues and improve
release readiness.
 Increased test coverage by 30% through systematic documentation, scenario expansion, and risk-based test planning.
 Reduced production bugs by 20% through early defect detection, clearer defect reports, and proactive collaboration with
developers.
 Improved stability of fraud management dashboards and supported releases without critical incidents.
NDA Company - QA Engineer, Team Lead | Nov 2020 - May 2022
 Worked on healthcare and insurance products, including patient/doctor portals, scheduling, notifications, treatment
management, claims processing, approval tracking, and reporting flows.
 Tested web and mobile applications on Android and iOS, created and maintained test documentation, and supported product
quality improvements.
 Mentored junior QA engineers, supported onboarding, reviewed QA solutions, facilitated knowledge sharing, and contributed
to performance review processes.
 Decreased bug leakage by 15% by strengthening regression checklists, improving QA process coverage, and validating high-
risk workflows.
 Reduced new QA ramp-up time by 25% through mentoring, structured onboarding, and knowledge transfer.
 Improved insurance claim processing efficiency by 20% through workflow validation and testing optimization.
Driveroo - QA Engineer | May 2019 - Nov 2020
 Tested web and mobile applications for a logistics and courier platform focused on vehicle status, technical condition tracking,
and operational workflows.
 Developed and maintained test documentation; conducted smoke, regression, functional, and usability testing.
 Suggested product improvements to enhance functionality, usability, and platform stability.
 Mentored junior QA team members and supported faster knowledge transfer within the QA process.
 Reduced regression testing time by 25% by optimizing test cases and introducing structured smoke testing.
 Reduced initial error rate by 20% by coaching new QA engineers and improving testing discipline.

SELECTED IMPACT
 6+ years of QA experience across iGaming, payments, logistics, healthcare, insurance, web, and mobile products.
 30% increase in test coverage through structured documentation and scenario expansion.
 20% reduction in production bugs through early defect detection and proactive developer collaboration.
 25% reduction in regression execution time through optimized test cases and structured smoke checks.
 Experience validating payment flows, transaction statuses, limits, bank transfers, cryptocurrency operations, integrations, and
back-office configurations.

EDUCATION
Master of Law - Kharkiv National University of Internal Affairs | 2011 - 2017

LANGUAGES
Ukrainian - Fluent | Russian - Fluent | English - Intermediate (B1-B2)