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 Platform Team at OpenX, specifically focusing on the Marketplace, which is responsible for the maintenance and development of the UI and API components of our platform. 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 platform engineering team focused on the Marketplace workflows that support how our core exchange operates. The components and tools help internal and external users manage marketplace settings, configure integrations for publishers and demand partners, review transaction setups, and ensure that platform behavior aligns with optimal liquidity and exchange performance.
In this senior SDET role, you will take strong ownership not only of test automation, but also of building new frameworks and maintaining existing ones — for TypeScript-based frontend applications as well as for API testing. This role is ideal for someone who wants to go beyond just testing and work on creating and maintaining test frameworks and testing approaches used across the organization.
The primary stack for this role includes: TypeScript, Playwright, React-based applications, Java, Python, Pytest, Spinnaker (CI/CD). The broader engineering environment also includes Node.js, GraphQL, GCP, and Kubernetes.
You do not need to be an expert in every part of our stack, but you definitely need to be eager to grow in those directions and bring a can-do attitude.
Prior AdTech experience is helpful, but not required.
What we offer:
Employment contract (22 595 - 25 254 PLN gross/monthly) OR B2B (181 - 202 PLN net/hourly)
Working with the newest technologies such as Cloud Computing (GCP)
Challenges at work that are difficult to find anywhere else!
Solving important problems in a scale
Joining a company that is growing and scaling
Flexible working hours & remote work option
Key responsibilities
Own, build, and evolve UI (TypeScript/Playwright) and API (Java/Python) test automation frameworks used across the organization, designing and maintaining tests across both layers for complex Marketplace workflows and integrations.
Improve the reliability, speed, and maintainability of test automation frameworks and CI/CD pipelines.
Be involved in all phases of platform development, from requirements and architecture design to validation, deployment, and release readiness.
Partner with engineers and stakeholders across the organization to identify quality risks early, applying risk-based testing to make pragmatic coverage decisions across unit, integration, API, and end-to-end levels.
Investigate test failures, flaky tests, and production issues, driving root cause analysis with actionable improvements.
Communicate quality risks, trade-offs, and recommendations clearly to engineering, product, and business stakeholders.
Required qualifications
5+ years of professional experience in test automation or software engineering in test, including hands-on experience designing and maintaining test automation frameworks, not just writing tests within them.
Strong hands-on experience with TypeScript and Playwright (or a comparable frontend framework such as Cypress).
Solid experience with API testing in Java and/or Python, ideally with pytest.
Practical knowledge of test design techniques and risk-based testing.
Experience with CI/CD tooling and pipelines, and improving automated test execution in CI environments.
Experience with Google Cloud Platform, Kubernetes, Docker, Spinnaker, or similar cloud and deployment technologies.
Excellent troubleshooting skills, able to triage complex issues across application, test, and infrastructure layers.
Experience working in an agile engineering environment.
Strong communication skills, comfortable working with SDETs, software engineers, and stakeholders across the organization.
Communicative Polish and English.
Our benefits (on employment contract):
Annual performance bonus
Tax-deductible system due to copyright protection: 75%
Private health care for you and your family (covered by OpenX)
Private life and travel insurance
MultiKafeteria program
Training: access to the LinkedIn Learning platform and Tech workshops
Holiday Allowance
Pension scheme (PPK from PZU)
Additional paid day off
Free parking lot
Access to peer-to-peer recognition platform
Monthly work-from-home allowance and one-time payment when you join us to help you set up your home office
We celebrate team members' important personal milestones (vouchers, gifts)
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, and value collective achievements. They are self-assured, open to coaching, and committed to continuous learning.
DRIVEN
Ideal 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.
SMART
Ideal 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 Policy
Effective Date of the Privacy Policy: November 21, 2024
