Freelance Senior QA Engineer (Mobile)

Unzer

Berlin QA & Testing 5 days ago via Arbeitnow

qa quality-assurance typescript automation xray jira ai mobile

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Job details

Company: Unzer
Location: Berlin
Field: QA & Testing
Source: via Arbeitnow

Posted July 21, 2026

About this role

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.

Nice to have:

Experience with Playwright & Selenoid

What’s next?

Does it sound exciting? - Apply with your CV in English. Please don’t shy away if you don’t meet all the requirements! We’re looking forward to meeting you.

We will get back to you within 14 days of receiving your application.

The interview process includes a 30-minute intro call with a TA Partner, a 60 minute call with the hiring manager, take home assignment and a 60-minute call with a peer team member. Please note the process might alter depending on our team’s availability.

*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.

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