Senior Software Engineer in Test IV (TS/Python)

Requirements

• 5+ years of professional experience in test automation or software engineering in test.
• Strong hands-on experience with TypeScript and modern frontend test automation frameworks such as Playwright or Cypress.
• Ability to design, debug, extend, and maintain test automation frameworks and shared testing utilities.
• Strong understanding of modern frontend applications, user workflows, API integration, asynchronous behavior, and common sources of UI test instability.
• Experience with API testing and practical experience with Python, preferably with pytest, or strong willingness to work with Python-based API test automation.
• Practical knowledge of test design techniques and risk-based testing.
• Experience working with CI/CD tools and improving automated test execution in CI environments.
• Excellent troubleshooting skills and ability to triage complex issues across application, test, and infrastructure layers.
• Experience working in an agile engineering environment.
• Strong communication skills and ability to work effectively with SDETs, software engineers, Product, and UX.
• Communicative Polish and English.

Additional Information

Company at a Glance OpenX is focused on unleashing the full economic potential of digital media companies. We do this by making digital advertising markets and technologies that are designed to deliver optimal value to publishers and advertisers on every ad served across all screens. At OpenX, we have built a team that is uniquely experienced in designing and operating high-scale ad marketplaces, and we are constantly on the lookout for thoughtful, creative executors who are as fascinated as we are about finding new ways to apply a blend of market design, technical innovation, operational excellence, and empathetic partner service to the frontiers of digital advertising. At OpenX Poland, we are looking for a talented, communicative, and curious Software Development Engineer IV in Test to join our team in Cracow, Poland. You will join the Core Exchange development team at OpenX. Our exchange handles billions of ad requests every day, connecting thousands of publishers with demand partners across the global advertising ecosystem. The platform runs in the cloud across multiple regions and operates at a scale where performance, reliability, correctness, and every millisecond matter. You will be part of a cross-functional product engineering team focused on business-critical workflows that support how advertising transactions are configured, reviewed, processed, and validated across OpenX. These tools help users manage business rules, review transaction setup, and keep platform behavior aligned with business agreements and financial processes. In this senior UI-focused SDET role, you will take strong ownership of test automation for TypeScript-based frontend applications, while also contributing to API integration and end-to-end testing using Python and pytest. This role is well suited for someone who wants to make UI test automation their primary area of expertise while also working regularly in the API testing area. In practice, we expect the work to be roughly two-thirds UI test automation and one-third API testing. The primary stack for this role includes: TypeScript, Playwright, React-based applications, Python APIs, Pytest, Spinnaker (CI/CD). The broader engineering environment also includes Node.js, GraphQL, Java, Go, GCP, and Kubernetes. You do not need to be an expert in all parts of our backend stack, but you should be comfortable collaborating with backend engineers and understanding service-level behavior. Prior AdTech experience is helpful, but not required. Team setup You will join a cross-functional product engineering team with a dedicated Product Manager, Scrum Master, Engineering Manager, QA engineers, frontend and backend engineers, and regular collaboration with UX designers. This setup gives you direct access to product context and a real opportunity to influence business requirements, solution design, test strategy, and release quality. On a daily basis, we use the Scrum framework with an open-minded attitude to adapt the process to our needs. Within the team, you will have the opportunity to work closely with other SDETs focusing on different domains, as well as be part of the QA Guild focused on making impactful changes to our tools and processes. OpenX VALUES Our five company values form a solid bedrock serving to define us as a group and guide the company. Our values remind us that how we do things often matters as much as what we do. WE ARE ONE We are one team. There are no exceptions. We are a group of strong and diverse individuals unified by a shared mission. We embrace challenges and win together as a team. We respect and care about our colleagues and cultivate an inclusive culture WE ARE CUSTOMER CENTRIC We innovate on behalf of our customers. We understand, respect, and listen carefully to our customers. We build great products to solve our customers' problems. We manage our customers' expectations clearly and honestly. We are a trusted partner to all of our customers - we act with integrity at all times. We care. OPENX IS OURS We are all owners of OpenX We all have a voice to improve OpenX We stake our personal and professional reputations on the excellence of our work We are not interested in just "doing our jobs"; we take ownership to drive results WE ARE AN OPEN BOOK We understand and respect what each of us does. We are eager to teach and share what we know with others, both internally and externally. We are eager to learn from others and we ask questions internally and externally. WE EVOLVE FAST We take responsible risks and own and learn from our mistakes. We recognize and repeat success. We actively seek out and provide constructive feedback. We adapt quickly and embrace change. We tackle growth and learning with real urgency. We are endlessly curious. OpenX TRAITS Our three traits capture what makes a great team member at OpenX. HUMBLE Ideal team players are humble and demonstrate integrity. They put the team's success above their own, share credit generously,

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