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openx

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

🇵🇱 Kraków, Polonia Presencial Tecnología Publicado May 22, 2026
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Ubicación Kraków, Polonia
Modalidad Presencial
Categoría Tecnología
Categoría IT QA / automatización de tests
Idioma English
Publicado 22 de mayo de 2026
Última verificación 30 de mayo de 2026
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Senior Software Engineer in Test IV (Python) - Fixed Term at openx: Kraków, Polonia; Presencial; Tecnología; QA / automatización de tests. JobGrid adds normalized role facts, source context, and a path to the employer application page so candidates can compare the listing before applying.

  • Location and workplace: Kraków, Polonia, Presencial
  • Role classification: Tecnología, QA / automatización de tests
  • Source freshness: checked by JobGrid on 2026-05-30.
  • Application path: candidates continue to the employer application page with non-personal referral tags.
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 release quality.

If you’re:

  • Analytical - able to connect business requirements, system behavior, and product risk.

  • Open-minded - happy to give and receive feedback, not afraid to fail, and move on.

  • Proactive - always looking for practical solutions and ways to move forward.

  • Self-organized and self-motivated.

We want to talk to you.

What we offer:

  • Employment contract (22 595 - 25 254  PLN gross/monthly) OR B2B (181 zł - 202 zł 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

  • Validate backend business logic in large-scale event processing systems running in the cloud, ensuring it behaves consistently with business requirements and financial processes.

  • Test backend APIs, data flows, and cross-system integrations that support business-critical workflows.

  • Build domain understanding and analyze requirements, business rules, and technical designs to identify meaningful test scenarios, edge cases, and risks.

  • Read, analyze, debug, and reason about application and test code to investigate issues and understand system behavior.

  • Create, maintain, and improve automated test suites and test frameworks.

  • Monitor and maintain QA CI pipelines and support continuous delivery.

  • Conduct root cause analysis of issues and provide solutions for better coverage and maintainability.

  • Collaborate closely with engineers, Product, QA, and other stakeholders throughout the full development lifecycle.

Required Qualifications

  • 5+ years of experience in test automation and software testing.

  • Strong 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.

  • Strong 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.

Desired Characteristics

  • 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.

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 (Covid insurance included)
  • 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
Applicants can review our Applicant Privacy Policy at any time by visiting the following link: https://www.openx.com/privacy-center/applicant-privacy-policy/.
Effective Date of the Privacy Policy: November 21, 2024