Principal AI-First Data Platform Architect

Sigma Software; Województwo małopolskie; On-site; PLN 240,000 - 360,000; Full time

Job summary

Sigma Software is building a greenfield, AI-first data platform for a global AdTech ecosystem. We seek a Principal/Staff Data Platform Engineer to drive architectural decisions, set engineering standards, and shape the foundation for scalable analytics and AI capabilities.

You will collaborate with experienced teams to design an immutable, event-driven architecture with governed data contracts and modern lakehouse principles, and you will own the first production-ready version of the platform in

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.
• 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 CI/CD, Infrastructure as Code, and production observability.
• Experience implementing data contracts, schema evolution, and data quality frameworks.

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

Data platform design

Distributed systems

Event-driven architecture

SQL & Python/Java/Scala

Iceberg/Spark/Flink/Trino

AWS cloud

CI/CD & IaC

Data modeling

Leadership

Tools

Apache Iceberg

Spark

Flink

Trino

AWS

CI/CD tooling

Infrastructure as Code

Job description

Sigma Software is building a greenfield, AI-first data platform for a global AdTech ecosystem. We seek a Principal/Staff Data Platform Engineer to drive architectural decisions, set engineering standards, and shape the foundation for scalable analytics and AI capabilities.

You will collaborate with experienced teams to design an immutable, event-driven architecture with governed data contracts and modern lakehouse principles, and you will own the first production-ready version of the platform in