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November 3, 2026
Mid Data Engineer (ETL)
Mid • Remote
110 - 145 PLN/yr
Warsaw, Poland
Quick Facts
Role: Mid Data Engineer (ETL)
Focus: Apache NiFi, PostgreSQL, REST API over databases, SQL optimization
Domain: Regulated sectors (including energy)
Description
We are looking for a Mid Data Engineer to work on client projects in regulated industries. You will develop an existing production data platform and build new solutions from scratch for collecting, processing, and sharing data.
Responsibilities
Build and develop data flows in Apache NiFi
Design and develop PostgreSQL databases
Prepare REST API endpoints over the database in collaboration with the frontend team
Optimize SQL queries for large data volumes
Requirements
Several years of experience with relational databases and ETL processes
Practical knowledge of Apache NiFi to independently design data flows
Good knowledge of PostgreSQL and data modeling
Experience optimizing SQL queries
Ability to prepare REST APIs over the database (configuration tools only; no Java/.NET programming required)
Basic knowledge of Python for writing scripts
Basic knowledge of Linux and bash
Ability to work independently
English language skills at least B2
Benefits
Not specified in the provided posting.
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