Оксана

Oksana Orekhova
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Senior QA Engineer | Backend & System Testing | API | Microservices
Summary:

Senior QA Engineer with 8+ years of experience working with web applications, backend testing, and
microservices-based architectures in the healthcare domain.

Strong technical background in API testing, database validation, and system-level analysis, including
verification of business logic, data integrity, and complex service interactions within distributed systems.

Hands-on experience working with REST APIs (Postman, Swagger, Insomnia), SQL/NoSQL databases (MySQL,
PostgreSQL, MongoDB), and monitoring tools such as Grafana, performing log analysis and validating end-to-
end data processing workflows.

Proven ability to establish QA processes, mentor QA engineers. Experienced in cross-team collaboration with
developers, product managers, and stakeholders.

Focused on backend, API, and system-level testing with interest in expanding automation expertise.

Core QA Expertise:

▪ Backend, API, Web UI testing
▪ System-level and integration testing
▪ Microservices architecture validation
▪ Data integrity and database validation
▪ Complex business workflow validation
▪ API test automation support (regression suites, test maintenance)
▪ Defect analysis and root cause investigation

Work Experience:

▪ Senior QA Engineer
DataArt Solutions, Inc. 2019 – Present
▪ QA Engineer
MedeAnalytics, Inc. 2017 – 2019

Healthcare Data & Patient Management Systems (2017–Present)

Clients: US-based healthcare providers and hospitals
Description:
Worked on multiple healthcare platforms including patient data management systems, screening systems
for clinical trials, and campaign management tools used in healthcare organizations. The systems included
admin portals, patient-facing web applications, data processing pipelines, data tables and analytics
dashboards.

Responsibilities:

▪ Performed backend and API testing for distributed systems and microservices architecture.
▪ Validated REST/SOAP APIs and performed SQL / NoSQL databases validation (MS SQL, MySQL,
MongoDB, Redis).
▪ Tested authentication and authorization flows, including token-based authentication, session
handling, and role-based access control across APIs and UI.
▪ Analyzed system logs and monitored system behavior using Grafana.
▪ Verified data processing workflows and end-to-end data consistency across systems.
▪ Created and maintained test cases and test documentation.
▪ Conducted web UI testing.
▪ Supported and executed API regression automation tests.
▪ Defined testing strategy and improved QA workflows within the team.
▪ Coordinated QA activities within a team of 4 engineers and participated in candidate interviews.
▪ Collaborated closely with developers, Product Owners, and stakeholders.
▪ Presented product demos and QA results to stakeholders.
▪ Validated product analytics events and user behavior tracking in Amplitude.
▪ Participated in release verification and deployment validation using Octopus Deploy.

Tech stack:

▪ API: Postman, Swagger, Insomnia
▪ Databases: PostgreSQL, MySQL, MS SQL, MongoDB, Redis
▪ Database Tools: MS SQL Management Studio, pgAdmin, Studio 3T, DBeaver
▪ CI/CD: Jenkins, Bitbucket
▪ Monitoring: Grafana
▪ Deployment: Octopus Deploy
▪ Analytics: Amplitude
▪ Test Management & Tracking Systems: Jira, Confluence, YouTrack, TestRail, Zephyr, qTest
▪ Development & IDE Tools: Visual Studio, Rider
▪ Methodology: Agile (Scrum)

Education:

▪ Master’s Degree - Law, Kharkiv Humanitarian Pedagogical Academy, Ukraine
▪ Master’s Degree - Power Mechanical Engineering Department, National Technical University
“Kharkov Polytechnic Institute,” Ukraine