Data QA Specialist / Data Tester (f/m/x)

Sii Poland; Łódź; On-site; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Centre of internal trainings

Medical care

Profit sharing

Great Place to Work

Job summary

Sii Poland is seeking an experienced Data QA Specialist to join a global team focused on data-driven initiatives. You will validate data quality, test ETL processes, and ensure reliable data pipelines across multiple projects.

The role requires strong SQL skills and Snowflake experience, plus the ability to adapt to various business domains while maintaining data accuracy and consistency. A collaborative environment and cross-functional teamwork are core to the role.

Qualifications

• 3+ years of experience as a Data QA Engineer or Data Tester.
• Strong data testing with ETL and data warehouse validation.
• Proficient in SQL and Snowflake.
• Experience with data reconciliation and data pipelines.

Responsibilities

• Test data solutions, ETL processes, and data pipelines.
• Validate data quality, consistency, and accuracy across sources.
• Test data warehouse and Snowflake implementations.
• Perform data reconciliation and identify quality issues.
• Create and maintain test scenarios and documentation.
• Collaborate with Data Engineers, Developers, and stakeholders.

Skills

Data testing

ETL testing

Data quality checks

SQL

Snowflake

Tools

Python

Job description

We are looking for an experienced Data QA Specialist / Data Tester to join a global team working on data-driven initiatives across multiple projects. In this role, you will be responsible for validating data quality, testing ETL processes, verifying data warehouse solutions, and ensuring the reliability of data pipelines used across the organization.

We are seeking professionals who can quickly adapt to different projects and business domains while maintaining a strong focus on data accuracy, consistency, and quality.

Your tasks

• Performing testing of data solutions, ETL processes, and data pipelines
• Validating data quality, consistency, and accuracy across multiple data sources
• Executing data warehouse and Snowflake testing activities
• Performing data reconciliation and identifying data quality issues
• Creating and maintaining test scenarios and test documentation
• Collaborating with Data Engineers, Developers, and Business Stakeholders to ensure high-quality data delivery

Requirements

• At least 3 years of experience as a Data QA Engineer, Data Tester, or in a similar role
• Strong background in data testing, including ETL and data warehouse validation
• Good knowledge of SQL and experience working with Snowflake
• Experience with data reconciliation, data quality checks, and testing data pipelines
• Ability to work across different projects and business domains

Nice to have

• Experience with Python

Job no. JOB-8YX3M

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care