Freelance Senior QA Engineer (Mobile)

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. At Unzer, 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 of 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 who are passionate about making a difference. Our offices: We are based across Austria, Denmark, Germany and Luxembourg with a HQ 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 E2E 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.