Python Engineer (Data Focus)

Hybrid in Krakow!

We’re looking for a Python Engineer (Data Focus) to help build a greenfield transactional platform designed to support millions of concurrent users.

The platform processes financial transactions in real time, where data integrity, sub-second performance, and reliability are critical. You’ll build scalable data pipelines and work with large datasets, streaming systems, and modern data infrastructure.

What you’ll do:

• Build and optimize Python-based data pipelines for batch and streaming processing.
• Develop ETL/ELT workflows and data transformation solutions.
• Work with large datasets, databases, and data lake/lakehouse architectures.
• Improve data processing performance, quality, and reliability.
• Collaborate with Backend, Data Engineering, and DevOps teams on a new data platform.

What we’re looking for:

• 3+ years of Python backend development experience.
• Hands-on experience building data pipelines and processing large datasets.
• Knowledge of batch and streaming data processing.
• Experience with Apache Spark, Hadoop, or similar technologies.
• Strong SQL, data modeling, and query optimization skills.
• Understanding of ETL/ELT and data lake or data warehouse architectures.

Nice to have: AWS S3, Kafka, Debezium, Databricks, Iceberg, Delta Lake, Airflow, or Dagster.