Markella Efthymiou
Markella Efthymiou

Senior QA Automation Engineer

Open to offers · Member since 25 Oct 2026
Location
Chios, Greece
Desired salary
Confidential
Work preference
Remote Only / Full Time, Part Time, Contract
Experience level
Lead

About

Professional summary

I am a Quality Engineering professional with more than 11 years of experience building test automation for API, mobile, and web products.

I design automation frameworks from the ground up using Java, Python, TypeScript, JavaScript, and Swift. My work includes functional, integration, regression, smoke, performance, and risk-based testing across distributed product teams.

I integrate automated suites into CI/CD pipelines and focus on stabilizing builds, reducing flaky tests, and improving release confidence. I have worked extensively with Jenkins, GitHub Actions, Docker, BrowserStack, and modern testing frameworks.

I use AI-assisted workflows with Claude Code, GitHub Copilot, Cursor, ChatGPT, and Gemini to accelerate test planning and generation, while validating all generated output against requirements and code-review checklists.

I have led QA practices, owned product quality and release readiness, mentored QA engineers, and collaborated closely with Product, Engineering, UX, and UAT stakeholders. I am experienced in asynchronous remote collaboration and am open to remote opportunities in Europe and the United States.

Skills

80 capabilities

Tech stack & tools

Working toolkit

Analytics

Application Hosting

Application Utilities

Design

Languages & Frameworks

Mobile

Experience

Career history

Senior QA Automation Engineer XE.gr

Built an AI-assisted test workflow using Claude Code, covering test planning, test generation, requirements validation, automation, and code-review checklist validation before merge. Expanded automated coverage for a business-critical API endpoint from zero to more than 200 tests.

Build and extend mobile and API automation with Appium, Selenium WebDriver, TestNG, and RestAssured. Run iOS and Android smoke suites on BrowserStack through Jenkins CI/CD and define QA processes and quality practices across XE and MJN mobile products and backend services.

Senior QA Engineer / QA Lead Goodnotes

Maintained and stabilized the Swift XCUITest regression suite, improving reliability and reducing test flakiness. Used AI-assisted workflows to generate and review test plans and test cases, and contributed automation capabilities to a QA engineering agent.

Owned quality for Meeting Assistant, defining test strategy, release criteria, risk-based coverage, and go/no-go readiness with Product and Engineering. Led three QA Engineers and applied shift-left testing and structured requirements analysis.

QA Automation Engineer / QA Consultant Sporty Group

Launched and maintained SportyBet automation across multiple regions, including 200 WAP tests, approximately 15 Android sanity tests, and approximately 400 REST API tests for one supported region.

Increased system test coverage by 15% through WAP, API, Android, and web testing frameworks. Integrated automated tests into Jenkins pipelines, maintained an approximately 95% test pass rate, and coordinated priorities across a distributed team.

Product Quality Owner 100mentors

Built Detox and WebdriverIO/Appium proof-of-concept automation frameworks from scratch for a mobile AI application. Developed AI-assisted testing processes using OpenAI tools to improve test planning and quality workflows.

Acted as both QA and Product Owner, aligning testing with product direction and establishing feedback loops across AI data research, UX, and UAT. Led cross-functional QA, UAT, and UX testing for the flagship MVP and identified and resolved 60% of defects during initial release testing.

Senior QA Automation Engineer OpenBet

Led the test automation roadmap and delivery of more than 1,000 integration test cases, strengthening product quality and reducing technical debt. Introduced shift-left testing by running regression tests in a Dockerized environment before deployment.

Stabilized CI/CD builds, reducing failure frequency from multiple times daily to approximately once per day. Mentored three QA Automation Engineers to improve team skills and automation coverage.

Software QA Automation Engineer Orfium

Designed and developed API and UI automation frameworks, including test data and environment preparation. Stabilized automated tests and integrated automation into Jenkins pipelines.

Supported QA Chapter practices in collaboration with Product Owners and developers. Introduced BDD practices to improve communication across Product, QA, and Engineering.

Senior QA Automation Engineer Epignosis eLearning solutions

Delivered approximately 1,000 smoke and regression tests across TalentLMS, TalentCards, and eFront, including around 300 personally developed automated tests.

Integrated automation with CI/CD pipelines to improve release efficiency. Stepped in to lead a QA Chapter of four following the QA Lead's departure.

Software R&D Engineer / Automation Tester Nokia

Developed test automation for new software features while embedded in a development team alongside engineers. Investigated application and automation-code issues affecting pipeline reliability.

Improved CI/CD success rates from 40% to 80%. Led testing for a team of six while also serving as Scrum Master and implementing SAFe practices.

Software Developer Nokia

Developed In-Service Upgrade features for an LTE network gateway product using C, C++, Python, and TDD. Moved the product's software upgrade process to the cloud.

Analyzed and fixed software defects, including customer-reported issues, while contributing to network gateway product development.

Education

Learning history
No education data available.

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