Senior Software Engineer in Test IV (Python) - Fixed Term

May 26, 2026

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Company at a GlanceOpenX 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. You will be part of the development team focused on exchange features for connected devices (CTV). Our exchange handles billions of ad requests daily connecting thousands of publishers with demand partners. Each request produces data events that have to be processed to extract business value from them. Temporary backfill until August 31, 2027. If you’re: Open-minded - happy to give & receive feedback, not afraid to fail, and move on Proactive - always want to find a satisfying solution Self-organized and self-motivated We want to talk to you. Project: The Upsiders team develops the auction and revenue mechanics that determine how transactions are priced, processed, and monetized across OpenX. Our work focuses on bid economics across both deals and the open exchange, including pricing, floors, fees, rebates, auction behavior, revenue calculation, and real-time reconciliation. We build systems that help ensure real-time platform calculations reflect actual financial processes and commercial agreements, enabling OpenX to support flexible business models, optimize monetization, and deliver accurate revenue outcomes for buyers, publishers, and internal teams. The team is using the following technologies: Frontend: JS/TS, React, Material UI API: Python, Java Backend: Java, Go, Erlang, Elixir CICD: Cloud build, Spinnaker What we offer:<ul> <li>Employment contract (22 595 - 25 254 PLN gross/monthly) OR B2B (181 zł - 202 zł PLN net/hourly)</li> <li>Working with the newest technologies such as Cloud Computing (GCP)</li> <li>Challenges at work that are difficult to find anywhere else!</li> <li>Solving important problems in a scale</li> <li>Joining a company that is growing and scaling</li> <li>Flexible working hours & remote work option</li> </ul> Key Responsibilities<ul> <li>Test large-scale event processing systems and back-end applications</li> <li>Involved in all phases of product development, starting from requirements to validation and deployment</li> <li>Analyze and improve efficiency, scalability, and stability of applications</li> <li>Work in a focused and nimble team that collaborates on common problems across products and across focus areas</li> <li>Own components, processes, and workflows that demand professionalism, excellent communication, teamwork, and documentation skills</li> <li>Create, maintain, and improve automation test suites/frameworks</li> <li>Monitor and maintain QA CI pipelines, collaborate on CD enablement</li> <li>Conduct root cause analysis of issues and provide solutions for better coverage and maintainability</li> <li>Effectively communicate and being a crucial member of both the project teams and QA organization</li> <li>Be exposed to a broader set of problems, which allows for fast career growth and proximity to abundant technical problems</li> </ul> Required Qualifications<ul> <li>5+ years of test automation experience</li> <li>Proficiency in Java OR Python and ability to improve, debug, modify and maintain an automation framework codebase</li> <li>Experience using CI/CD tools like Jenkins, Spinnaker, or Cloud Build</li> <li>Excellent troubleshooting skills to triage complex issues</li> <li>Experience operating in an agile environment</li> <li>Communicative Polish and English languages</li> <li>Bachelor’s degree in Computer Science or equivalent degree</li> </ul> <div> </div> Desired Characteristics<ul> <li>Experience in using Google Cloud Platform, k8s, and docker</li> <li>Experience with UI testing</li> <li>Familiarity with advertising technologies and the advertising ecosystem</li> </ul> Our benefits (on employment contract):<ul> <li>Annual performance bonus</li> <li>Tax-deductible system due to copyright protection: 75%</li> <li>Private health care for you and your family (covered by OpenX)</li> <li>Private life and travel insurance (Covid insurance included)</li> <li>MultiKafeteria program </li> <li>Training: access to the LinkedIn learning platform and Tech workshops </li> <li>Holiday Allowance</li> <li>Pension scheme (PPK from PZU)</li> <li>Additional paid day off </li> <li>Free parking lot </li> <li>Access to peer to peer recognition platform</li> <li>Monthly work-from-home allowance and one-time payment when you join us to help you set up your home office</li> <li>We celebrate team members' important personal milestones (vouchers, gifts)</li> </ul> OpenX VALUESOur 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 ONEWe 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 CENTRICWe 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 OURSWe are all owners of OpenXWe all have a voice to improve OpenXWe stake our personal and professional reputations on the excellence of our workWe are not interested in just "doing our jobs"; we take ownership to drive results WE ARE AN OPEN BOOKWe 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 FASTWe 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 TRAITSOur three traits capture what makes a great team member at OpenX. HUMBLEIdeal team players are humble and demonstrate integrity. They put the team's success above their own, share credit generously, and value collective achievements. They are self-assured, open to coaching, and committed to continuous learning. DRIVENIdeal team players are results-driven and motivated. They are curious, always seeking more to do, learn, and take on. As proactive problem-solvers, they take initiative without needing external motivation. They continuously think about the next steps and opportunities for improvement. SMARTIdeal team players are smart and possess the intellectual acumen to understand the complexities of our organization and industry. They are interpersonally intelligent, good communicators, and exemplify sound judgment in their interactions across the company to foster a collaborative environment. OpenX is committed to equal employment opportunities. It is a fundamental principle at OpenX not to discriminate against employees or applicants for employment on any legally-recognized basis including, but not limited to: age, race, creed, color, religion, national origin, sexual orientation, sex, disability, predisposing genetic characteristics, genetic information, military or veteran status, marital status, gender identity/transgender status, pregnancy, childbirth or related medical condition, and other protected characteristic as established by law. OpenX Applicant Privacy PolicyApplicants can review our Applicant Privacy Policy at any time by visiting the following link: <a class="postings-link" href="https://www.openx.com/privacy-center/applicant-privacy-policy/">https://www.openx.com/privacy-center/applicant-privacy-policy/</a>. Effective Date of the Privacy Policy: November 21, 2024

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