Serhii

SERHII MAHDENKO
Senior QA Engineer · Automation & Manual · Web · Mobile · API
Odesa, 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»)

SUMMARY
● Senior QA Engineer with 10+ years across web, mobile, and API products — 8 products, from greenfield startups
to high-traffic global platforms — owning quality end-to-end and building automation that reduces release risk and
speeds up delivery.
● Strong automation engineer: Cypress (JavaScript/TypeScript), Selenium (Java), BDD, and Docker-based CI/CD
(GitHub Actions, GitLab CI).
● Built QA processes and automation frameworks from scratch; led testing across up to 5 platforms in parallel.
● AI-augmented workflow: use Claude Code for test generation, maintenance, and failed-run analysis — certified by
Anthropic Academy.
● Balances large automated suites (1,500+ scripts) with hands-on manual, functional, and exploratory testing.

SKILLS
Automation Cypress · JavaScript / TypeScript · Selenium WebDriver · Core Java · JBehave / BDD · Thucydides / Serenity
AI-assisted QA Claude Code · AI test-case generation · AI-assisted debugging & failed-run analysis · prompt engineering for
test design
CI/CD GitHub Actions · GitLab CI · Docker · automated regression on every build
Testing Functional · Manual · API · E2E · Regression · Load / Stress · Mobile · Web Automation · Exploratory · System
Tools REST / Postman · GraphQL · Allure · Git · MySQL · Jira · TestRail · TestLink · Wireshark · Dev Tools · JMeter
Methodology Agile · Scrum · Kanban · BDD
Soft skills Ownership · Mentoring · Cross-functional collaboration · Clear communication · Risk assessment · Release sign-off
Certifications Anthropic Academy (Claude Code 101, Claude Code in Action, Claude Cowork) · IBM Cybersecurity · Google
Threats & Vulnerabilities · Cisco CCNA · Selenium WebDriver · SQL Fundamentals
Languages English — B2 (Upper-Intermediate)

WORK EXPERIENCE
Senior QA Engineer · Zazmic 01/2023 – Present · Remote
Zira — Agile Project Management & Issue-Tracking Platform
● Designed and owned the Cypress E2E automation framework for core product flows (boards, sprints, issues, roles
& permissions).
● Integrated the suite into the CI/CD pipeline (GitLab CI + Docker) so the full regression runs automatically on
every build.
● Introduced an AI-assisted workflow (Claude Code) for generating and maintaining Cypress tests and analyzing
failed runs from Allure reports — significantly cutting regression debugging time.
● Built automation reporting for management: multi-sprint Allure / Google Sheets dashboards tracking coverage,
velocity, and year-end forecast.
● Validated REST and GraphQL integrations via Postman and ran feature-level exploratory testing ahead of each
release.
● Key results: 600+ E2E tests at ~87% coverage of critical flows; 15+ integration defects caught pre-release.
Winechain — Blockchain Supply-Chain Platform (greenfield)
● Established the QA process from zero — test strategy, test plan, and coverage model for a new blockchain product.
● Automated E2E and API checks with Cypress (TypeScript) — covered ~70% of critical product flows — and
manually verified on-chain transaction flows.
● Key result: contributed to a ~40% reduction in regression effort through automation.
ZConnect — Billing & Reporting Platform
● Built and maintain a Cypress/Allure QA suite for ZConnect covering functional, regression, API/DB, and E2E
checks of billing and reporting services.

● Redesigned handling of slow asynchronous report/invoice generation jobs (delays from ~72 sec up to ~26 hours)
using a “seed early / verify later” pattern.
● Consolidated duplicated DB-polling logic — previously copied across 6 specs with different timeout budgets —
into a single shared helper.
● Implemented an automated test-data cleanup registry so QA-created records are deleted after each run, with run
isolation for parallel executions.
● Introduced an AI-assisted workflow using Claude Code to generate Cypress tests directly from test-case rows in
the team's tracking sheet, and to triage failed regression runs by reading raw Allure JSON results instead of the UI
report — cross-checking each failure against a maintained known-bugs list.
● Key result: accelerated one regression spec from 7m48s to ~1m15s via the seed-early/verify-later pattern.
Senior QA Engineer · Rakuten 10/2021 – 11/2022 · Remote
Rakuten Advertising — Global Performance-Marketing Platform
● Developed and maintained an API regression suite of 1,000+ tests covering backend logic for a high-traffic
advertising platform; added ~150 scenarios.
● Maintained the existing UI regression suite (Selenium/Java) — fixing and updating tests after regression runs to
keep pace with interface changes, rather than authoring new UI tests from scratch.
● Key result: cut the API regression cycle from ~2 days to ~4 hours.

QA Engineer · KeepSolid 04/2020 – 07/2021 · Odesa
KeepSolid VPN — Cross-Platform Security Application
● Led testing across 5 platforms in parallel (iOS, Android, macOS, Windows, Linux) and owned production sign-off.
● Introduced a risk-based testing approach to prioritize coverage under tight release timelines.
● Key result: 0 critical post-release incidents across 3 consecutive releases.

QA Engineer · Zazmic 09/2018 – 03/2020 · Remote
OneLogin — Identity & Access Management (SSO / MFA / OAuth)
● Tested security-critical IAM flows (single sign-on, multi-factor auth, OAuth) across web, mobile, and desktop.
● Built and curated a structured test-case library for authentication and access scenarios.
● Key result: ~90% regression coverage of core IAM flows.

QA Engineer · Petrosoft 12/2016 – 08/2018 · Odesa
SmartPOS — Retail Point-of-Sale System
● Mentored 4 junior QA engineers and set the team's testing standards and defect-triage process.
● Ran JMeter load tests at 500+ concurrent users to validate POS performance under peak retail load.
● Key result: 0 critical production bugs across 6 consecutive releases.

Junior QA Engineer · AB-SOFT 01/2015 – 11/2016 · Odesa
RingCentral VoIP — Enterprise IP-Phone Platform
● Tested enterprise hardware IP phones (Cisco, Polycom, Yealink) alongside iOS / Android clients; maintained a
regression suite of 2,000+ cases.

EDUCATION
Odessa I. I. Mechnikov National University — Physics & Thermophysics