Valentyna Kostiukevych

QA Lead / Product Delivery Analyst at Devexperts

Led QA efforts for a complex trading platform (web + mobile) for Schwab. Managed a team of 5–6 QAs, introduced quality-first processes and SDLC improvements, shifted QA left, coordinated with product and engineering, and maintained release readiness.

QA Lead / Product Delivery Analyst at Devexperts

Lead QA efforts for a complex trading platform (web + mobile) built for Schwab. Managed a team of 5–6 QAs, introduced quality-first processes, restructured SDLC to shift QA left, and improved test coverage, release readiness and cross-team collaboration.

QA Engineer at Smart Pension

Initiated and led pre-refinement sessions for QA, defined test scenarios ahead of engineering kick-offs, and designed and maintained release-wide test plans in JIRA, Swagger, and Postman. Improved QA coverage and streamlined demos for stakeholders; enabled CI/CD readiness.

QA Engineer at SmartPension

Worked on a UK retirement planning platform integrated with government policies and financial forecasts. Initiated pre-refinement QA sessions, defined test scenarios ahead of engineering kickoff, led testing and created reusable test artifacts to improve regression coverage.

QA Engineer / Product & Billing Analyst at Cloudflare

Owned validation and behavioral analysis of billing flows (checkout, upgrades, renewals, refunds). Conducted deep root-cause investigations using SQL, API payloads, and logs; built dashboards for live incident tracking; wrote custom reconciliation queries between Stripe, Salesforce and internal billing systems; improved test coverage and CI readiness.

QA Engineer / Product & Billing Analyst at EPAM Systems

Worked on enterprise-scale software solutions across domains with focus on QA process implementation, documentation quality, and regression stability. Built structured SDLC framework and mentored junior QAs; maintained test docs, test results, and bug reports; enabled knowledge transfer.