Vasyl

VASYL SUDIAKOV
SOFTWARE QA ENGINEER | API / BACKEND / DISTRIBUTED SYSTEMS | MANUAL QA
Kyiv, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Telegram: @StahlHerzoG | Open to remote (EU / US)

PROFESSIONAL SUMMARY
Software QA Engineer with broad hands-on experience testing high-load SaaS platforms, REST APIs, backend
services, web/mobile products, and data-intensive distributed systems. Strong focus on end-to-end API and
backend validation, data integrity across microservices, SQL-based verification, Kafka event flows, regression,
release validation, and production issue investigation. Comfortable working across the full QA cycle with
developers, DevOps, and product stakeholders in Agile delivery environments.
CORE EXPERTISE
API & Backend — REST APIs (GET, POST, PUT, Data & Distributed Systems — SQL, MS SQL,
PATCH, DELETE), Postman, Swagger, client-server PostgreSQL, ClickHouse, MongoDB, Kafka event
flows, backend validation. validation, microservices, data integrity, log analysis.

Quality Engineering — Functional, integration, smoke, Delivery & Platforms — BrowserStack, iOS/Android,
regression, API, performance, release validation, defect Jira, Confluence, Azure DevOps, Jenkins, Git, DevTools,
investigation and fix verification. Qase.io, Ranorex, JMeter, basic Python, Figma.

PROFESSIONAL EXPERIENCE
Software QA Engineer | PAR Technology Corporation
Sep 2021 - Sep 25, 2026
• Validated end-to-end data flows across REST APIs, Kafka event streams, and SQL databases, focusing on
consistency between distributed microservices before release.
• Designed and executed API/backend coverage for a high-load SaaS platform, including positive and negative
scenarios, payload validation, status codes, error handling, and service integrations.
• Investigated production issues with developers and DevOps, reproduced defects from application behavior and
data state, and verified fixes through focused retesting and regression.
• Covered web and mobile release paths across iOS, Android, and major browsers with BrowserStack while
combining UI checks with backend verification.
• Supported release quality within CI/CD workflows through smoke, regression, integration, and business-critical
validation before deployment.
• Automated repetitive validation workflows with Ranorex to reduce manual effort in recurring checks and improve
repeatability.
Quality Assurance Engineer | Dynamo Development, Inc.
Jul 2019 - Aug 2021
• Tested web and mobile systems across functional, smoke, and regression scopes, with API/backend validation
for client-server architecture and integrations.
• Covered e-commerce journeys end to end: catalog, search, product pages, cart, checkout, payment flows,
shipping, returns, promotions, and user accounts.
• Created and maintained practical QA assets - test plans, test cases, checklists, and detailed Jira defect reports
- to support repeatable regression and release verification.
• Ran basic load and performance checks for key business and payment flows to assess stability under increased
user activity.
• Worked within Agile delivery throughout the SDLC, collaborating with the team to clarify expected behavior,
reproduce issues, and verify fixes.

VASYL SUDIAKOV | SOFTWARE QA ENGINEER - API / BACKEND / DISTRIBUTED SYSTEMS
SELECTED PROJECT HIGHLIGHTS
Data Central
High-load SaaS | API / backend / data validation
• Validated REST APIs in Postman and Swagger, covering payloads, response codes, error handling, and end-to-end
backend behavior.
• Verified integrations between multiple POS systems, backend services, and data-processing workflows, with
emphasis on data consistency across connected services.
• Investigated discrepancies across API, service, and database layers and confirmed fixes through regression and
release validation.
DMN
Business workflows | integrations | location-based functionality
• Performed functional, smoke, and regression testing of web-based business workflows and internal modules.
• Validated core backend logic and integrations across business-critical scenarios, then reproduced issues and verified
fixes through regression cycles.
• Covered location-based scenarios involving addresses, branches, regions, service areas, and related business rules.
Мій Дім Онлайн
Web & mobile | customer-facing workflows | stakeholder collaboration
• Tested resident web/mobile flows, forms, notifications, and release changes, combining functional validation with
regression coverage.
• Prepared and maintained test documentation and investigated customer-reported defects from reproduction through
fix verification.
• Worked directly with customers and stakeholders to clarify expected behavior, acceptance criteria, and issue context.
Web Stores (Magento)
E-commerce | checkout / payments | release stability
• Validated catalog, search, product pages, cart, checkout, payment flows, promotions, shipping, returns, user
accounts, and related integrations.
• Performed regression checks across critical e-commerce scenarios and release changes, with basic
load/performance checks under increased activity.

QA SCOPE & WORKING STYLE
• Test design: requirements analysis, test cases, checklists, negative scenarios, integration coverage, and release-
focused regression.
• Defect lifecycle: clear reproduction steps, evidence gathering, fix verification, retesting, and regression around
affected areas.
• Production support: issue investigation with developers/DevOps, validation of service behavior and underlying data,
and confirmation of corrective changes.
• Collaboration: Agile/Scrum/Kanban teams, cross-functional communication, and direct clarification with stakeholders
when needed.

TOOLS & TECHNOLOGIES
API / data: Postman, Swagger, REST, SQL, MS SQL, PostgreSQL, ClickHouse, MongoDB, Kafka, microservices
QA / delivery: Jira, Confluence, Azure DevOps, Jenkins, Git, DevTools, Qase.io, BrowserStack, Figma
Automation / performance: Ranorex, Apache JMeter, basic Python; Selenium / Java coursework

EDUCATION, COURSES & LANGUAGES
EDUCATION COURSES LANGUAGES
Interregional Academy of Personnel Software Testing Course - QALight Ukrainian - native
Management, Kyiv Automated Testing (Selenium / Java) - Russian - native
Psychology (Medical Psychology) | 2004- QALight English - upper-intermediate
2008
First Kyiv Medical College, Kyiv
Laboratory Diagnostics | 1994-1996