Data BI Analyst

We're looking for an independent mid-to-senior Data or BI Analyst with real programmatic or ad tech experience. You would join one of Poland's largest online publishers, in the advertising area. Your purpose is to own the data layer of their advertising ecosystem. You'd connect raw data in columnar databases with day-to-day business operations by automating API data pulls, reporting and BI dashboard feeds. This is a role for someone who builds product-oriented analytical solutions, not someone who only runs reports.

Details:

Location: Warsaw, Poland. Hybrid, with 3 days a week in the office.

Employment: Full-time

Seniority: Mid to Senior

Stack: SQL, Python, ClickHouse, Trino, Power BI, REST APIs, Google Ad Manager, SSP, Airflow, Git

What you'll do

Own the analytics data layer across the advertising and programmatic ecosystem

Automate data extraction from ad platform and SSP APIs

Build and maintain the data feeds behind BI dashboards

Turn raw data from large-volume columnar databases into solutions the business can use

Work closely with the sales and programmatic teams

What you bring

3+ years in a Data Analyst, BI Analyst or similar role

Professional experience in advertising, programmatic or ad tech, with a solid understanding of SSPs and Google Ad Manager

SQL on large-volume columnar databases (ClickHouse, Trino, BigQuery, Hive)

Python for automation, including REST APIs and data processing

Proven ownership of analytical solutions and dashboards in Power BI, Superset or Tableau, beyond pure execution

Nice to have

Experience pulling data from the Google Ad Manager API or similar platforms

Git and orchestration tools such as Airflow

Daily use of AI coding assistants (Claude Code, Cursor, Codex) or other LLM tools

Background at a publisher or ad tech firm in a product-oriented role

Hiring process

Interview with Hiring manager

Task sheet, which focuses on your approach and reasoning (AI use is allowed)

Conversation with manager