Openx20d ago

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

Poland·KrakówRemoteFixed Termsenior

OtherSoftware Engineer In Test

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Quick Summary

Requirements Summary

Analytical - able to connect business re

Technical Tools

OtherSoftware Engineer In Test

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.

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

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.

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.

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.

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

Location & Eligibility

Where is the job

Kraków, Poland

Remote within one country

Who can apply

Listing Details

Posted: May 22, 2026
First seen: May 22, 2026
Last seen: June 11, 2026

Posting Health

Days active: 20
Repost count: 0
Trust Level: 44%
Scored at: June 12, 2026

Signal breakdown

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Apply for this position

Openx

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OpenX is an independent omni-channel supply-side platform (SSP) and a global leader in supply-side curation, transparency, and sustainability, powering advertising across CTV, app, mobile web, and desktop.

Employees

350

Founded

2007

Domain

Jobs

External application · ~5 min on Openx's site

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