Senior Manual QA Engineer (German-speaking)

Techstack is a technology product engineering company that sets an example for high development standards in the IT industry. We empower each team member to influence the development of the product, company, and processes.

About the role:
We are looking for an experienced Senior Manual QA Engineer for a long-term, part-time B2B engagement(4 years).
This opportunity is ideal for QA professionals who are looking for an additional project alongside their current employment or freelance engagements.
Language requirements:
German: B2 or higher, with documented proof of proficiency.
English: B2 or higher, with documented proof of proficiency.
The project involves testing a multilingual web platform powered by a CMS, as well as a mobile application available on iOS and Android. The web platform supports more than 12 languages, bringing additional attention to functional consistency, content accuracy, and user experience across different language versions.
You will collaborate with an international, distributed team, contribute to structured testing activities, and help ensure a reliable experience for users across web and mobile platforms.
The role is primarily remote and includes occasional on-site testing sessions in Vienna, up to three days per year. Business travel expenses will be covered.
Requirements
At least 3 years of experience working at Senior QA level.
Experience participating in at least 5 software projects.
ISTQB Certified Tester Foundation Level (CTFL) or a higher-level ISTQB certification.
Hands-on testing experience in at least 2 of the following areas:
Backend and API testing.
Enterprise CMS testing.
Mobile application testing for iOS and/or Android.
Experience working in Agile environments and distributed teams.
German proficiency at B2 level or above.
English proficiency at B2 level or above.
Documentary proof of both language levels, subject to the applicable certification requirements.
Responsibilities
Perform manual functional, regression, and exploratory testing of web and mobile applications.
Design, maintain, and execute test cases and test scenarios.
Test backend functionality and APIs, CMS-based platforms, and mobile applications.
Identify, document, and track defects, ensuring clear reproduction steps and useful supporting evidence.
Validate application behavior across different devices, platforms, and language versions.
Collaborate with developers, QA colleagues, and other stakeholders to investigate and resolve issues.