Senior Test Automation Engineer IV (Java/Python)

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.

We’re seeking a Senior Software Development Engineer in Test (SDET IV) to drive quality and reliability in high-scale, low-latency systems. You’ll build automation frameworks, validate complex distributed platforms, and collaborate with engineering and product teams to ensure performance and resilience where every millisecond counts.

An ideal candidate is:

• Open-minded – Welcomes feedback, learns from failure, and adapts quickly to change.
• Proactive – Takes initiative to identify problems and drive thoughtful, effective solutions.
• Self-motivated & Organized – Manages priorities independently and follows through with clarity and accountability.

We are operating at a scale:

• 100% Cloud-based (GCP) platform
• Over 400 billion Ad requests every day
• Over 120 000 CPU daily
• Over 140 TB RAM daily
• Over 50 PB of data per week
• Over 1200 production deployments a month

What we offer:

• Employment contract (21 250 - 23 750 PLN gross/monthly) OR B2B (167 - 186 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 responsibilites:

• Test large-scale event processing systems and back-end applications
• Involved in all phases of product development, starting from requirements to validation and deployment
• Analyze and improve efficiency, scalability, and stability of applications
• Work in a focused and nimble team that collaborates on common problems across products and across focus areas
• Own components, processes, and workflows that demand professionalism, excellent communication, teamwork, and documentation skills
• Create, maintain, and improve automation test suites/frameworks
• Monitor and maintain QA CI pipelines, collaborate on CD enablement
• Conduct root cause analysis of issues and provide solutions for better coverage and maintainability
• Effectively communicate and being a crucial member of both the project teams and QA organization
• Be exposed to a broader set of problems, which allows for fast career growth and proximity to abundant technical problems

Required qualifications:

• 5+ years of test automation experience
• Proficiency in Java and Python and ability to improve, debug, modify and maintain an automation framework codebase
• Experience using CI/CD tools like Jenkins, Spinnaker, or Cloud Build
• Excellent troubleshooting skills to triage complex issues
• Experience operating in an agile environment
• Communicative Polish and English languages
• Bachelor’s degree in Computer Science or equivalent degree

Nice to have:

• Experience in using Google Cloud Platform, k8s, and docker
• Familiarity with advertising technologies and the advertising ecosystem
• Familiarity with high-volume data platform and technology stacks such as Druid, Spark, Kafka and etc.

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)