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 uniquely experienced in designing and operating high-scale ad marketplaces, and we are constantly on the lookout for thoughtful, creative executors who are fascinated by applying market design, technical innovation, operational excellence, and empathetic partner service to the frontiers of digital advertising.

The Role

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, 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.

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.

Key Responsibilities

Own, build, and evolve UI (TypeScript/Playwright) and API (Java/Python) test automation frameworks used across the organization
Design and maintain 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 to identify quality risks early, applying risk-based testing to make pragmatic coverage decisions
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
Hands-on experience designing and maintaining test automation frameworks
Strong experience with TypeScript and Playwright (or comparable frontend frameworks 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
Experience with Google Cloud Platform, Kubernetes, Docker, Spinnaker, or similar cloud technologies
Excellent troubleshooting skills across application, test, and infrastructure layers
Experience working in an agile engineering environment
Strong communication skills in Polish and English

Compensation

Employment contract: 22,595 – 25,254 PLN gross/monthly
B2B: 181 – 202 PLN net/hourly

Benefits (on employment contract)

Annual performance bonus
Tax-deductible system due to copyright protection: 75%
Private health care for you and your family
Private life and travel insurance
MultiKafeteria program
Training: access to LinkedIn Learning and Tech workshops
Holiday allowance
Pension scheme (PPK from PZU)
Additional paid day off
Free parking lot
Peer-to-peer recognition platform
Monthly work-from-home allowance and one-time payment for home office setup
Celebrations for team members’ personal milestones (vouchers, gifts)

OpenX Values

We Are One — unified team, inclusive culture, respect and care for colleagues
We Are Customer Centric — innovate on behalf of customers, act with integrity, build trusted partnerships

Senior Test Automation Engineer IV