Senior Data Engineer (Databricks Migration)

Sigma Software; Województwo mazowieckie; Hybrid; PLN 240,000 - 360,000; Full time

Job summary

Sigma Software is seeking a Senior Data Engineer to join its Data Engineering Center of Excellence in Warsaw/Województwo mazowieckie. You will lead migration from BigQuery to Databricks, design scalable Lakehouse architectures, and optimize large-scale data pipelines for a retail analytics platform.

Ideal candidates have 5+ years of data engineering, strong Python/SQL, Databricks, Spark, and Delta Lake experience, plus cloud expertise and CI/CD practices.

Qualifications

• 5+ years of professional experience as a Data Engineer.
• Strong programming skills in Python and advanced SQL.
• Hands-on commercial experience with Databricks.
• Strong knowledge of Apache Spark, primarily PySpark.
• Experience designing and building modern cloud-based data platforms.
• Experience developing ETL / ELT pipelines and large-scale data processing solutions.
• Hands-on experience with Delta Lake.
• Experience with Spark Declarative Pipelines.
• Experience with cluster monitoring, metrics analysis, and performance optimization.
• Strong understanding of distributed data processing architectures.
• Solid understanding of data warehousing concepts and dimensional modeling.
• Experience with Airflow or similar orchestration tools.
• Experience optimizing complex analytical SQL workloads.
• Experience implementing CI / CD practices for data engineering platforms.
• Strong troubleshooting and performance optimization skills.
• Ability to work collaboratively in cross-functional international teams.
• Upper-Intermediate or higher English level.

Responsibilities

• Participate in migration of large-scale analytical platform from BigQuery to Databricks.
• Design and implement scalable Lakehouse architectures using Databricks and Delta Lake.
• Analyze ETL/ELT workloads and define migration approaches.
• Develop and optimize data pipelines for large retail datasets and analytics tasks.
• Implement incremental processing strategies and scalable transformation frameworks.
• Build and maintain Spark-based data processing solutions with PySpark.
• Design and maintain medallion architecture layers (Bronze, Silver, Gold).
• Implement data governance and security best practices using Unity Catalog.
• Collaborate with Data Science, Analytics, Product, and Customer Engineering teams.
• Participate in architecture discussions and technical solution design.
• Develop reusable data platform components and engineering standards.
• Conduct code reviews and contribute to platform reliability and maintainability.
• Troubleshoot and optimize complex SQL and Spark workloads.
• Support production deployments and platform modernization activities.

Skills

Python

SQL

Cross-functional collaboration

English proficient

Tools

Databricks

Apache Spark

PySpark

Delta Lake

Airflow

CI/CD

Job description

Are you a Senior Data Engineer passionate about building scalable, high-performance data platforms and working with modern Lakehouse technologies? Join Sigma Software’s Data Engineering Center of Excellence and contribute to the modernization of an enterprise-scale analytics ecosystem for the retail domain.
We are looking for a Senior specialist with strong Databricks, PySpark, and cloud data engineering expertise to participate in the migration of a large-scale analytical platform from BigQuery to Databricks. You will collaborate with international teams, contribute to architectural decisions, and help shape reliable and scalable data solutions.
We at Sigma Software create opportunities for continuous learning, technology growth, and meaningful engineering impact while working on complex international projects.

CUSTOMER

Our Customer is a leading retail technology company specializing in AI-driven pricing optimization solutions for enterprise retailers. The company helps businesses improve profitability and competitiveness through advanced analytics, automation, and intelligent pricing strategies. Their platform combines business intelligence with sophisticated algorithms to support data-informed pricing decisions at scale for global retail organizations.

PROJECT

The project focuses on the strategic migration of a large-scale analytical platform from a legacy BigQuery ecosystem to a modern Databricks Lakehouse architecture. The platform processes high-volume retail datasets, machine learning workloads, analytics pipelines, and customer-specific business logic.
As part of the modernization initiative, the engineering team is implementing scalable Spark-based processing, Delta Lake architecture, medallion data layers, and modern governance practices. The role offers an opportunity to work with distributed data processing systems, optimize large-scale workloads, and contribute to the evolution of an enterprise-grade data platform.

Key Technologies: Databricks, Apache Spark, PySpark, Delta Lake, Python, SQL, Airflow, GCP, CI/CD, Unity Catalog

• Participate in the migration of a large-scale analytical platform from BigQuery to Databricks
• Design and implement scalable Lakehouse architectures using Databricks and Delta Lake
• Analyze existing ETL / ELT workloads and define migration approaches
• Develop and optimize data pipelines processing large volumes of retail and analytical data
• Implement incremental processing strategies and scalable transformation frameworks
• Build and maintain Spark-based data processing solutions using PySpark
• Design and maintain medallion architecture layers including Bronze, Silver, and Gold
• Implement data governance and security best practices using Unity Catalog
• Collaborate with Data Science, Analytics, Product, and Customer Engineering teams
• Participate in architecture discussions and technical solution design
• Develop reusable data platform components and engineering standards
• Conduct code reviews and contribute to platform reliability and maintainability
• Troubleshoot and optimize complex SQL and Spark workloads
• Support production deployments and platform modernization activities

• 5+ years of professional experience as a Data Engineer
• Strong programming skills in Python and advanced SQL
• Hands-on commercial experience with Databricks
• Strong knowledge of Apache Spark, primarily PySpark
• Experience designing and building modern cloud-based data platforms
• Experience developing ETL / ELT pipelines and large-scale data processing solutions
• Hands-on experience with Delta Lake
• Experience with Spark Declarative Pipelines
• Experience with cluster monitoring, metrics analysis, and performance optimization
• Strong understanding of distributed data processing architectures
• Solid understanding of data warehousing concepts and dimensional modeling
• Experience with Airflow or similar orchestration tools
• Experience optimizing complex analytical SQL workloads
• Experience implementing CI / CD practices for data engineering platforms
• Strong troubleshooting and performance optimization skills
• Ability to work collaboratively in cross-functional international teams
• Upper-Intermediate or higher English level

WILL BE A PLUS

• Experience working with GCP cloud services
• Experience with AWS or Azure cloud platforms
• Experience in retail analytics or pricing optimization domains
• Experience supporting machine learning or AI-related data workloads
• Experience with platform modernization and cloud migration initiatives

PERSONAL PROFILE

• Strong analytical and problem-solving mindset
• Proactive and ownership-driven approach
• Ability to work independently and collaboratively
• Good communication and stakeholder collaboration skills
• Passion for scalable data engineering and modern data platforms
• Interest in continuous learning and technology innovation