OpenX
digital advertising
SeniorSoftwareEngineerinTestIV(Python)-FixedTerm
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“Senior Software Engineer in Test IV (Python) - Fixed Term at OpenX. Skills: Python, Test automation, Backend API testing, CI/CD. Validate backend business logic. Test backend APIs, data flows, integrations”
What You'll Achieve.
Ensure platform behavior consistent with business requirements; Ensure platform behavior consistent with financial processes; Support CI/CD and release readiness; Identify risks early
Industry & Context.
Analytical; Troubleshooting complex issues; Reason about application and test code
What They're Looking For.
Must Have
5+ years of experience in test automation and software testing, Python skills for test automation, debugging, and framework maintenance, Experience testing backend APIs and business logic, Experience creating, maintaining, and improving automated test suites or test frameworks, Experience with CI/CD tools such as Jenkins, Spinnaker, or Cloud Build, Ability to read, analyze, debug, and reason about application or test code, Excellent troubleshooting skills to triage complex issues, communication skills, including the ability to raise risks, ask clarifying questions, challenge assumptions, and explain findings clearly, Experience working in an agile, cross-functional engineering environment, Ability to communicate effectively in Polish and English
Nice to Have
Familiarity with Java or experience working with Java-based systems, Experience with Google Cloud Platform, Kubernetes, and Docker, Experience with advertising technology, marketplace platforms, financial workflows, or revenue-related systems
What You'll Do.
Validate backend business logic
Build domain understanding
improve automated test suites
maintain QA CI pipelines
Conduct root cause analysis
How You'll Work.
Team & Collaboration
Collaborate closely with engineers, Product, QA, stakeholders; Work in an agile, cross-functional engineering environment; Give and receive feedback; Communicate effectively in Polish and English
Communication Scope
Ability to raise risks; Ask clarifying questions; Challenge assumptions; Explain findings clearly; Communicate effectively in Polish and English
Full Job Description
## Description 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’re looking for talented, communicative, and curious engineers to join our team in Cracow, Poland. Currently, we’re looking for a Software Developer in Test IV. Temporary backfill until August 31, 2027. Our exchange handles billions of ad requests daily, connecting thousands of publishers with demand partners across the global advertising ecosystem. You will be part of a product engineering team focused on business-critical workflows that support how advertising transactions are configured, processed, and validated across OpenX. As an SDET IV, you will take ownership of quality for business logic, backend APIs, data flows, and cross-system integrations. You will design and improve automated test coverage, identify risks early, support CI/CD and release readiness, and help the team ensure that platform behavior remains consistent with business requirements and financial processes. 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 support from data analysts and UX designers when needed. This setup gives you direct access to product context and a real opportunity to influence business requirements, solution design, test strategy, and
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