Principal Data Platform Engineer — AI-First AdTech

Sigma Software; Kraków; On-site; PLN 380,000 - 580,000; Full time

Job summary

Sigma Software is seeking a Principal/Staff Data Platform Engineer in Kraków, Poland, to own architectural decisions and establish engineering standards for a next-generation data platform. You will drive immutable event-driven design, lakehouse concepts, and scalable analytics, collaborating across engineering teams to deliver production-ready capabilities.

Ideal candidates bring 8+ years building production-grade data platforms, deep experience with Iceberg, Spark, Flink, Trino, and cloud

Qualifications

• 8+ years of experience designing and operating production-grade data platforms.
• Strong expertise in distributed data systems and high-volume event-driven architectures.
• Deep understanding of modern lakehouse architectures and Apache Iceberg.
• Advanced SQL skills and production experience with Python, Java, or Scala.
• Experience with distributed processing and query technologies such as Spark, Flink, or Trino.
• Strong knowledge of data modeling, partitioning strategies, and performance optimization.
• Proven experience building batch and near-real-time data pipelines.
• Hands-on experience with AWS cloud infrastructure.
• Strong understanding of CI/CD pipelines, Infrastructure as Code, and production observability.
• Experience implementing data contracts, schema evolution, and data quality frameworks.
• Ability to make pragmatic architectural decisions in greenfield environments.
• Upper-Intermediate or higher English level.
• Strong communication and technical leadership skills.

Responsibilities

• Lead the technical design and architecture of a modern enterprise-scale data platform.
• Define scalable data flows from Iceberg-based event storage into analytical and operational data products.
• Evaluate and select technologies for orchestration, transformation, querying, serving, and storage.
• Design reusable canonical entities and data models across advertising, campaigns, inventory, billing, and customer domains.
• Establish scalable engineering patterns for batch and near-real-time processing.
• Build reliable and observable data pipelines for high-volume AdTech workloads.
• Implement data quality, lineage, observability, and reconciliation capabilities.
• Collaborate with Platform Engineering teams to introduce CI-enforced data contracts and governance standards.
• Define tenant isolation, access control, and regional data boundary strategies.
• Establish standards for testing, deployment automation, schema evolution, and versioning.
• Optimize platform performance, scalability, and infrastructure costs.
• Mentor engineers and contribute to engineering excellence across the team.
• Partner closely with leadership and cross-functional stakeholders.

Skills

Distributed data systems

Event-driven architectures

Apache Iceberg

SQL

Python

Java

Scala

AWS

CI/CD

Tools

Spark

Flink

Trino

CI/CD pipelines

Job description

Sigma Software is seeking a Principal/Staff Data Platform Engineer in Kraków, Poland, to own architectural decisions and establish engineering standards for a next-generation data platform. You will drive immutable event-driven design, lakehouse concepts, and scalable analytics, collaborating across engineering teams to deliver production-ready capabilities.

Ideal candidates bring 8+ years building production-grade data platforms, deep experience with Iceberg, Spark, Flink, Trino, and cloud