Олена

Olena Tretiakova
QA Engineer — Web · Mobile · API | Payments & AI-Augmented Testing
Mizhhiria, Ukraine · [open contact info](look above in the "contact info" section) · LinkedIn Olena Tretiakova

SUMMARY QA Engineer who runs the full QA lifecycle solo — test planning, coverage design,
regression with 1.4 years experience.
Payments: end-to-end testing of PayPal & Google Pay via Stripe and Braintree, multi-currency flows.
Undocumented systems: rebuilds test coverage through API reverse engineering (Swagger + live
response analysis) when specs don’t exist.
AI-augmented workflow: daily use of Claude for edge-case generation, API response analysis, and
persistent project knowledge bases.

KEY HIGHLIGHTS
Payments domain. Owned payment-flow testing across PayPal and Google Pay (Stripe & Braintree,
multiple currencies); caught a checkout currency-mismatch bug before it reached production.
Testing with zero documentation. Rebuilt full test coverage of a legacy system with no docs and no
client access — reverse-engineered expected behavior from raw API responses, including an
undocumented endpoint controlling.
Regression at scale. Built and owned a 2,000+ item regression checklist structured by module and
permission role; re-prioritized by business impact when release timelines compressed. Security-aware
testing.
Beyond standard QA scope: identified an IDOR vulnerability via user-ID manipulation; tested SQL
injection, XSS, and brute-force lockout behavior.

EXPERIENCE
QA Engineer (Sole QA) — Cross-platform mobile product March 2026 – May 2026 owned testing
end-to-end for iOS, Android, and backend APIs — from smoke testing to deep exploratory sessions.
Independently scoped and prioritized all testing work with no pre-defined task assignments; managed
regression cycles around each build release. Built a structured Claude project (Swagger specs, Figma
screens, API responses) as a persistent knowledge base — fast context recovery and edge-case
generation for exploratory testing.
QA Engineer — Payments / e-commerce & fleet-management products (software development
company) February 2025 – February 2026 Payment integration testing: owned end-to-end coverage
of PayPal and Google Pay via Stripe and Braintree across multiple currencies for a subscription
ecommerce product; found and reported a currency-mismatch bug between the pricing page and
PayPal checkout, with video-documented reproduction steps. Sole QA for 2 products simultaneously
(web, mobile, browser extension, admin panel): a leasing/fleet-management OMS with 5+ user roles
and multi-status entities, plus a subscription e-commerce product — zero missed releases. Built
Postman collections from scratch based on Swagger documentation; validated data-flow consistency
between backend and multiple frontend clients. Ran a full regression pass before every release using
the 2,000+ item checklist; introduced mandatory regression checklists as a release quality gate and
defined severity/priority conventions in Jira.
SKILLS & TOOLING
API & data: REST API testing, Postman (Collections & Environments), Swagger, SQL, Chrome
DevTools (Network/Console)
Testing: test planning, test case & checklist design, manual testing (Web, iOS/Android, browser
extensions), regression, smoke, exploratory, cross-browser, UI/UX, release sign-off;
Security testing basics (IDOR, SQLi, XSS, brute force)
Payments: PayPal, Google Pay — via Stripe and Braintree, multi-currency flows
AI-assisted QA: structured Claude projects as persistent knowledge bases (Swagger, Figma, API
responses); AI-assisted edge-case discovery and bug-report drafting
Automation (in progress): WebdriverIO fundamentals — test scripts for registration, login, and
user-edit flows;
Workflow: Git, Jira, ClickUp, Qase, Redmine, Figma

LANGUAGES Ukrainian — Native · English