Openx6h ago

New

Senior Software Engineer in Test IV (TS/Python)

Poland·KrakówRemoteFull-Timesenior

OtherSoftware Engineer In Test

0 views0 saves0 applied

Apply Now

Quick Summary

Overview

Company at a Glance OpenX is focused on unleashing the full economic potential of digital media companies.

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 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 Core Exchange development team at OpenX. 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 product engineering team focused on business-critical workflows that support how advertising transactions are configured, reviewed, processed, and validated across OpenX. These tools help users manage business rules, review transaction setup, and keep platform behavior aligned with business agreements and financial processes.

In this senior UI-focused SDET role, you will take strong ownership of test automation for TypeScript-based frontend applications, while also contributing to API integration and end-to-end testing using Python and pytest. This role is well suited for someone who wants to make UI test automation their primary area of expertise while also working regularly in the API testing area. In practice, we expect the work to be roughly two-thirds UI test automation and one-third API testing.

The primary stack for this role includes:

TypeScript, Playwright, React-based applications, Python APIs, Pytest, Spinnaker (CI/CD).

The broader engineering environment also includes Node.js, GraphQL, Java, Go, GCP, and Kubernetes.

You do not need to be an expert in all parts of our backend stack, but you should be comfortable collaborating with backend engineers and understanding service-level behavior.

Prior AdTech experience is helpful, but not required.

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 regular collaboration with UX designers. This setup gives you direct access to product context and a real opportunity to influence business requirements, solution design, test strategy, and release quality.

On a daily basis, we use the Scrum framework with an open-minded attitude to adapt the process to our needs. Within the team, you will have the opportunity to work closely with other SDETs focusing on different domains, as well as be part of the QA Guild focused on making impactful changes to our tools and processes.

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

Design and maintain reliable automated tests across TypeScript-based UI and Python API layers.

Own and evolve test automation for complex frontend user workflows.

Build, maintain, and improve automated UI test suites using Playwright and TypeScript.

Contribute to API integration and end-to-end testing strategy, automation, and coverage using Python and pytest.

Be involved in all phases of product development, from requirements and solution design to validation, deployment, and release readiness.

Partner with software engineers, product managers, and UX designers to identify quality risks early and improve testability.

Apply risk-based testing practices and make pragmatic decisions about test coverage at unit, integration, API, and end-to-end levels.

Improve the reliability, speed, and maintainability of test automation frameworks and CI/CD pipelines.

Investigate test failures, flaky tests, and production issues, and drive root cause analysis with actionable improvements.

Communicate quality risks, trade-offs, and recommendations clearly to engineering and product stakeholders.

5+ years of professional experience in test automation or software engineering in test.

Strong hands-on experience with TypeScript and modern frontend test automation frameworks such as Playwright or Cypress.

Ability to design, debug, extend, and maintain test automation frameworks and shared testing utilities.

Strong understanding of modern frontend applications, user workflows, API integration, asynchronous behavior, and common sources of UI test instability.

Experience with API testing and practical experience with Python, preferably with pytest, or strong willingness to work with Python-based API test automation.

Practical knowledge of test design techniques and risk-based testing.

Experience working with CI/CD tools and improving automated test execution in CI environments.

Excellent troubleshooting skills and ability to triage complex issues across application, test, and infrastructure layers.

Experience working in an agile engineering environment.

Strong communication skills and ability to work effectively with SDETs, software engineers, Product, and UX.

Communicative Polish and English.

Experience with Python test automation.

Experience testing React-based applications.

Experience with Google Cloud Platform, Kubernetes, Docker, Spinnaker, or similar cloud and deployment technologies.

Experience with API contract testing, integration testing, or service-level testing.

Familiarity with advertising technology, digital media, or the advertising ecosystem.

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, learn, and move forward.

Proactive: always looking for practical solutions and ways to improve quality and delivery.

Self-organized and self-motivated.

A team player who communicates clearly and helps others raise the engineering quality bar.

We want to talk to you.

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: June 3, 2026
First seen: June 3, 2026
Last seen: June 3, 2026

Posting Health

Days active: 0
Repost count: 0
Trust Level: 76%
Scored at: June 3, 2026

Signal breakdown

freshnesssource trustcontent trustemployer trust

Apply for this position

Openx

lever

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

Please let Openx know you found this job on Jobera.