Senior Big Data Engineer IV

at Openx

Krakow, hybrid, senior, full time, PLN 23,375–26,125 / month, 5+ years

posted 03 Jul 2026

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Airflow
Java
BigQuery
Scala
Google Cloud Platform
k8s
Dataform
SQL
Apache Spark
NoSQL
Docker
RDBMS
dbt
CI/CD
AWS
Python

About the role

Posted: 2026-07-03

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.

You will work in all aspects of agile application development, including our enterprise platform that interfaces with a multitude of services that are dependent on to deliver billions of requests per day. Your opinions will be important in all phases of product development, starting from requirements to validation and deployment. Working on the enterprise platform, you will be working with multiple distributed teams to architect, create, and deliver new features and functionality in order to deliver the best possible advertising experience in the market. Scalability, performance, and rock-solid reliability are all factors to consider with every line you code. The Team and Project You will be part of the core data platform team. Our exchange handles billions of ad requests daily connecting thousands of publishers with demand partners. Each request produces data events that have to be processed to extract business value from them. Daily our applications produce more than 1PB of data.

What you would do

- Design large-scale data processing systems.

- Work with Product to drive the requirements, and own the project end-to-end.

- Analyze and improve the efficiency, scalability, and stability of applications.

- Think long-term and be unsatisfied with band-aids.

- Identify unnecessary complexity and remove it.

What they are looking for

- 5+ years experience in Java or Scala development (Python is a plus)

Read from jobs.lever.co, last seen 2d ago.

What comes with it

- Employment contract (23 375 - 26 125 PLN gross/monthly) OR B2B (186 - 208 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

- 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