Data Engineer

Sigma Software; Warszawa; On-site; PLN 170,000 - 250,000; Full time

Job summary

Sigma Software is seeking a Data Engineer to help build scalable cloud-native data platforms for a deep-tech fusion energy research initiative. You will work with Databricks, Spark, AWS and Azure to enable analytics, experimentation, and ML workflows.

Join a team of scientists and engineers in a highly innovative R&D environment focusing on data quality, provenance, and cost-efficient cloud architectures while advancing sustainable energy research.

Qualifications

• 3+ years of commercial experience in data engineering.
• 2+ years production experience with Databricks.
• Strong Python, PySpark, and SQL skills.
• Experience with AWS services such as S3, IAM, KMS.
• Knowledge of IaC and CI/CD practices.
• Experience with MLflow and experiment tracking.
• Understanding of data quality, lineage, and provenance concepts.

Responsibilities

• Design, develop, and maintain scalable data platforms and pipelines for analytics and operational use cases.
• Build distributed data processing workflows using Apache Spark, PySpark, and Databricks.
• Develop and evolve cloud-native data solutions leveraging Azure and AWS services.
• Model and optimize data structures for analytics, reporting, and downstream consumption.
• Integrate data from multiple heterogeneous sources while ensuring data quality, consistency, and traceability.
• Implement data quality controls, schema validation, lineage tracking, and monitoring processes.
• Collaborate closely with scientists, analysts, and engineering teams to translate business and research requirements into technical solutions.
• Contribute to CI/CD processes, infrastructure automation, and engineering best practices.
• Research and introduce new technologies and approaches within the data engineering ecosystem.

Skills

Databricks

Delta Lake

PySpark

Python

SQL

AWS

CI/CD

Terraform

Git

MLflow

Data Quality

Tools

Databricks Unity Catalog

Lakeflow Jobs

Terraform

Git workflows

CI/CD tooling

Job description

Join a project shaping the future of sustainable energy through cutting-edge data engineering and scientific innovation. We are looking for a Data Engineer to help build scalable cloud-native data platforms for a deep-tech Customer working on one of the most ambitious fusion energy initiatives in the world.

You will work with modern distributed data technologies, including Databricks, Apache Spark, AWS, and Azure, while solving complex engineering challenges in a research-intensive environment.

We at Sigma Software value engineering excellence, long-term partnerships, and continuous learning. This is an opportunity to contribute to breakthrough scientific initiatives while working with modern technologies and highly skilled global teams.

PROJECT

The project focuses on building and evolving a modern cloud-based data platform supporting scientific research, analytics, and operational workflows in the fusion energy domain. The team develops scalable distributed data processing solutions while ensuring high standards of data quality, lineage, governance, reproducibility, and operational reliability.
You will work closely with scientists and engineers to support experimentation, analytics, and machine learning workflows in a highly innovative R&D environment.

Job Description

• Design, develop, and maintain scalable and reliable data platforms and pipelines for analytics and operational use cases
• Build distributed data processing workflows using Apache Spark, pySpark, and Databricks
• Develop and evolve cloud-native data solutions leveraging Azure and AWS services
• Model and optimize data structures for analytics, reporting, and downstream consumption
• Integrate data from multiple heterogeneous sources while ensuring data quality, consistency, and traceability
• Implement data quality controls, schema validation, lineage tracking, and monitoring processes
• Optimize performance, scalability, reliability, and cost-efficiency of data pipelines and infrastructure
• Collaborate closely with scientists, analysts, and engineering teams to translate business and research requirements into technical solutions
• Contribute to CI/CD processes, infrastructure automation, and engineering best practices
• Research and introduce new technologies and approaches within the data engineering ecosystem

Qualifications

• 3+ years of commercial experience in Data Engineering
• 2+ years of hands‑on production experience with Databricks
• Strong expertise with Delta Lake, including medallion architecture and table optimization
• Advanced proficiency in Python, pySpark, and SQL
• Deep practical knowledge of Databricks components including Unity Catalog, Lakeflow Jobs / Workflows, and job optimization
• Hands‑on experience with AWS services including S3, IAM, KMS, and at least one of AWS Batch, ECR, EventBridge, Lambda, or API Gateway
• Experience designing event‑driven and asynchronous data pipelines
• Strong knowledge of Infrastructure as Code and CI/CD practices
• Practical experience with Terraform and Databricks Asset Bundles
• Experience working with Git workflows, pull request reviews, and automated testing
• Understanding of secure authentication approaches such as OIDC and service principals
• Practical experience with MLflow, experiment tracking, model registry, and reproducibility practices
• Strong understanding of data quality, lineage, schema contracts, and provenance concepts
• Experience with data quality frameworks such as Great Expectations, Soda, pyDeequ, or Databricks DQX
• Experience monitoring and optimizing data platform reliability and cloud costs
• Upper-Intermediate or higher English level

WILL BE A PLUS:

• Experience packaging workloads using Docker and running batch workloads in AWS
• Familiarity with ECR and containerized data processing solutions
• Experience with experiment optimization libraries such as scikit-optimize, BoTorch, Ax, or scipy
• Understanding of ML feature engineering and leakage prevention techniques
• Experience working in regulated or high-security environments
• Knowledge of data governance, compliance, and data residency requirements
• Experience disabling or restricting AI‑assisted tooling/features in secure environments

Additional Information

By clicking the link above or any third-party link within this posting, you are leaving this site and going to a third-party website where the third-party website's terms and privacy policy apply