Big Data Engineer IV

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OpenX is seeking a senior software engineer to work on their core data platform handling billions of ad requests daily and processing over 1PB of data. The role involves designing large-scale data processing systems, collaborating with product teams to define requirements, and improving application efficiency, scalability, and stability. Candidates must have 8+ years of experience in Java, Scala, or Python development, 3+ years in Big Data systems, and expertise with tools such as Apache Spark, BigQuery, Airflow, and cloud platforms (GCP or AWS). Knowledge of CI/CD, DevOps practices, and database design (RDBMS/NoSQL) is required. The position offers a full-time employment contract or B2B option, flexible working hours with remote work possibility, and various benefits including health care, bonuses, and training opportunities. The job location is Krakow, Poland, with all interview stages conducted remotely.