Python Engineer for Portfolio Systems & Data Pipelines

Explore Group; Warszawa; Hybrid; PLN 120,000 - 150,000; Full time

Job summary

Explore Group is expanding its data engineering team to build high-scale transaction fee calculation and portfolio management engines supporting platforms handling over trillions of euros in assets. You will design, develop, and optimize data processing workflows with Python and SQL, focusing on speed and reliability.

You will work in a hybrid setup with teams across Europe, contribute to ingestion, transformations, and performance tuning, and mentor junior engineers as needed.

Qualifications

• 1–2 years of experience for junior level or 3–5 years for senior in software or data engineering with Python and SQL
• Bachelor's degree in Computer Science or Software Engineering
• Experience with PostgreSQL strongly preferred
• Good English communication (B1/B2 for Junior, fluent for Senior)

Responsibilities

• Build and maintain robust data pipelines and automated processing services using Python and relational databases.
• Senior: lead SQL optimization, indexing, execution plans, and performance profiling on large tables.
• Integrate data frameworks to streamline ingestion, transformations, and transaction fee logic.
• Collaborate with distributed engineering and infrastructure teams across Europe in a hybrid structure

Skills

Python

SQL

English

PostgreSQL

Polars

Education

Bachelor of Science (BSc / Inżynier) in Computer Science or Software Engineering

Tools

Relational databases

Job description

Explore Group is expanding its data engineering team to build high-scale transaction fee calculation and portfolio management engines supporting platforms handling over trillions of euros in assets. You will design, develop, and optimize data processing workflows with Python and SQL, focusing on speed and reliability.

You will work in a hybrid setup with teams across Europe, contribute to ingestion, transformations, and performance tuning, and mentor junior engineers as needed.