Senior Data Analyst, ETL

Jobtailor; Warszawa; On-site; PLN 160,000 - 210,000; Full time

Job summary

Jobtailor in Warszawa, Poland seeks an experienced ETL/Data Engineer to design and maintain ETL pipelines across multiple client accounts, clean and reconcile multi-source exports, and write production Python scripts for data transformation and reporting.

You will integrate with ad-platform APIs, including Meta and TikTok, mentor junior team members on data hygiene, ensure quality before client delivery, and collaborate with analytics and Strategic Intelligence teams to scope new custom

Qualifications

• Advanced SQL and Python skills.
• Real ETL experience, including cleaning, reconciling, and dedup logic.
• API integration experience.
• Ability to scope and own technical work across multiple clients with minimal oversight.
• Exposure to identity-resolution or customer-match style data work (nice to have).
• Familiarity with warehouse tools such as Snowflake or workflow automation such as n8n (nice to have).
• Basic stats or marketing-science literacy (nice to have).

Responsibilities

• Design and maintain ETL pipelines across multiple client accounts.
• Clean, reconcile, and join messy multi-source exports.
• Write production Python scripts for data transformation, taxonomies, and custom reports.
• Integrate with ad-platform and partner APIs, including Meta and TikTok.
• Mentor junior team members on data hygiene.
• Quality-control work before client delivery.
• Partner with analytics and Strategic Intelligence teams to scope new custom deliverables.

Skills

Advanced SQL Skills

Advanced Python Skills

ETL Experience

API Integration Experience

Data Hygiene Mentorship

Identity-Resolution Data Work

Tools

Snowflake

N8n

Meta API

TikTok API

Job description

• Design and maintain ETL pipelines across multiple client accounts
• Clean, reconcile, and join messy multi-source exports
• Write production Python scripts for data transformation, taxonomies, and custom reports
• Integrate with ad-platform and partner APIs, including Meta and TikTok
• Mentor junior team members on data hygiene
• Quality-control work before client delivery
• Partner with analytics and Strategic Intelligence teams to scope new custom deliverables

Requirements

• Advanced SQL and Python skills
• Real ETL experience, including cleaning, reconciling, and dedup logic
• API integration experience
• Ability to scope and own technical work across multiple clients with minimal oversight
• Exposure to identity-resolution or customer-match style data work (nice to have)
• Familiarity with warehouse tools such as Snowflake or workflow automation such as n8n (nice to have)
• Basic stats or marketing-science literacy (nice to have)
• Right to stay/work in Poland based on an accepted legal status

Core Competencies

Demonstrates expertise in designing and maintaining ETL pipelines, with advanced skills in SQL and Python for data transformation and integration. Capable of mentoring team members and ensuring quality control in deliverables while collaborating with analytics teams.

Highest-signal resume keywords

• Advanced SQL Skills
• Advanced Python Skills
• ETL Experience
• API Integration Experience
• Data Hygiene Mentorship

Hard Skills

• ETL Pipeline Design
• Data Cleaning
• Data Reconciliation
• Data Transformation
• Production Python Scripting
• Dedup Logic
• Custom Reporting
• Identity-Resolution Data Work
• Basic Statistics Literacy
• Marketing-Science Literacy

Soft Skills

• Collaboration
• Quality Control
• Mentoring

Industry Keywords

• Client Accounts
• Data Hygiene
• Custom Deliverables
• Technical Scoping

Tools & Technologies

• Snowflake
• N8n
• Meta API
• TikTok API