Freelance Senior QA Engineer (Mobile)

Unzer Group; Berlin; Vor Ort; EUR 70.000 - 90.000; Vollzeit

Zusammenfassung

Unzer Group in Berlin is seeking a seasoned QA automation engineer for mobile app testing (iOS and Android). You will design and maintain automated test suites using TypeScript, with Sauce Labs and Appium, and validate API interactions via Postman across devices.

You’ll collaborate with developers and product owners to broaden end‑to‑end test coverage, including inter‑device communications and hardware interfaces, while maintaining robust cross‑platform tests.

Qualifikationen

• 4+ years of professional experience in mobile application testing (iOS and Android).
• Experience in test automation using TypeScript and platforms such as Sauce Labs, Appium, or similar.
• Strong knowledge of data structures and databases (PostgreSQL, SQLite).
• Experience testing APIs and using Postman for validation.

Aufgaben

• Architect, develop, and maintain automated tests for mobile apps using TypeScript.
• Design and maintain test plans for new features and integrate with Jira and Xray.
• Execute and improve test cases, including inter‑device communications and hardware testing.

Kenntnisse

Mobile testing

TypeScript

Sauce Labs

Appium

Postman

Databases (PostgreSQL/SQLite)

API testing

Cross‑device communication

Tools

Webdriver.io

Playwright

Selenoid

Jobbeschreibung

About Us

Unzer is a leading European fintech company with a mission to simplify international payments for e-commerce and retail businesses. Our brand was formed from 13 companies that now contribute to building a unique product covering the entire payment flow. We are driven by the belief that customers should enjoy a seamless shopping experience, no matter where they choose to shop. We are a team of over 700 experts from 55 different nationalities, dedicated to creating a state‑of‑the‑art unified commerce platform. Our goal is to enable businesses to delight their customers with a seamless payment experience. Whether you're a tech enthusiast, payment expert, or a dedicated support professional, we are looking for individuals passionate about making a difference.

Our offices

We are based across Austria, Denmark, Germany and Luxembourg with a headquarters in Berlin.

About the Team

As a member of the Unzer Unified POS team, you will play a pivotal role in testing Unzer’s mobile POS applications for Android and iOS. You will focus on elevating service quality and ensuring seamless functionality. The mobile applications interact with a variety of hardware components, such as barcode scanners, receipt printers, and card payment terminals.

What your work will look like

• Architect, develop, and maintain test automation using Sauce Labs, primarily with TypeScript
• Design and maintain test plans for existing and new application features, and integrate them with Xray and Jira
• Execute, maintain, and improve test cases in Xray, and enhance their integration into workflows
• Test setups that include peripheral hardware such as card payment terminals, receipt printers, and barcode scanners
• Test inter‑device communication between multiple in-house applications, such as customer‑facing displays or helper applications for gastronomy
• Develop and maintain cross‑team test scenarios, including API communication and database operations
• Leverage AI tools: actively use and adapt AI tools in daily QA tasks, exploring innovative solutions and maintaining a curiosity‑driven approach
• Collaborate with developers and product owners to achieve optimal test coverage, focus on end‑to‑end multiplatform testing coverage but also system tests that reach a realistic experience of the customers & merchants
• Engage in code reviews to uphold coding standards and improve overall code quality
• Conduct multi‑environment testing: execute tests across various environments to ensure robustness and compatibility

Current tech stack of the team

Current automation framework & language: TypeScript & Webdriver.io. Tooling: Java based.

What you need to be successful in this role

• Ability to work from our Berlin office twice a week to perform in‑office device testing
• 4+ years of professional experience in mobile application testing (iOS and Android)
• Experience in test automation using TypeScript and platforms such as Sauce Labs, Appium, or similar
• Experience with test case design, including designing test plans and following industry standards
• Strong knowledge of data structures and databases, particularly PostgreSQL and SQLite
• Solid understanding of different types of APIs and experience testing them using tools such as Postman
• Experience testing hardware devices and inter‑device communication
• Experience in release management and communication
• A structured mindset with a proactive approach to test planning ahead of development
• Experience in the fintech or payment industry, retail, or gastronomy POS is a strong plus
• Experience writing automated tests and defining test scenarios throughout the development lifecycle, with most testing performed through automation

Nice to have

• Experience with Playwright & Selenoid

Equal Employment Opportunities

Unzer is an equal employment opportunities workplace, and we commit to hiring regardless of race, sex, gender identification, sexual orientation, national origin, native language, religion, age, disability, marital status, citizenship, genetic information, pregnancy, or any other characteristic protected by law. Please refrain from including your picture and age with the application.