Big Data Engineer IV

OpenX group; Kraków; On-site; PLN 260,865 - 291,555; Full time

Benefits offered by this job

Annual performance bonus

Private health care

Holiday Allowance

Training access to LinkedIn

Flexible working hours

Job summary

OpenX group, located in Kraków, is seeking a skilled developer to create large-scale data processing systems. You will engage with various teams to deliver top-tier advertising experiences by improving application performance and scalability.

The ideal candidate has over 8 years of experience in Java, Scala, or Python and at least 3 years in Big Data systems. Join us to tackle challenges with cutting-edge technologies and flexible working conditions.

Qualifications

• 8+ years experience in Java, Scala or Python development.
• 3+ years of experience in Big Data systems development.
• Experience building complex data pipelines.

Responsibilities

• Design large-scale data processing systems.
• Work with Product to drive the requirements.
• Analyze and improve the efficiency of applications.

Skills

Java

Scala

Python

Big Data systems

SQL

Apache Spark

Google Cloud Platform

AWS

Docker

CI/CD

Airflow

Education

Bachelor’s degree in computer science, physics, or related field

Tools

BigQuery

Dataform

Job description

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.

Please note: all interview stages are run remotely!

Key responsibilities

• 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.

Required Qualifications

• 8+ years experience in Java, Scala or Python development
• 3+ years of experience in Big Data systems development
• Experience building complex data pipelines, including SQL‑based transformations with tools such as dbt or Dataform, and large‑scale data processing with distributed frameworks such as Apache Spark.
• Expertise using BigQuery or other data warehouses including performance tuning and monitoring.
• Understands data orchestration tools like Airflow to extend it with new data pipelines and troubleshoots its operational issues.
• Cloud experience with Google Cloud Platform or AWS, k8s, and Docker.
• Understanding of CI/CD, automated testing, monitoring and other DevOps practices.
• Fluently speak algorithms, data structures, and platforms.
• Experience with database system design, RDBMs and/or NoSQL.
• Bachelor’s degree in computer science, physics, or related field. A Master’s degree is a plus.
• Communicative Polish and English.

Desired qualifications

• Be comfortable using the right tools and languages for the job, even brand new ones.
• Have the ability to develop scalable, modular applications.
• SCRUM / Agile environment experience.
• Experience working in digital media, marketing technology or advertising technology is a big plus.
• Good written & oral communication skills.
• Good sense of humor.
• Team player.
• Self‑starter with the ability to independently identify and act on areas of improvement.

What we offer

• 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

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 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.

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