Senior Java Engineer — Real-Time Audience Platform (Remote)

Visa Hunt; Poland; On-site; PLN 180,000 - 320,000; Full time

Job summary

Sigma Software is seeking a Senior Java Engineer to join a real-time audience segmentation project. You will design and implement core components, including a flexible segment definition language and scalable evaluation engines.

You will drive relationship-based audience resolution, incremental recomputation, and event-driven pipelines for accuracy and performance. You will work with product and engineering teams, contribute to architecture decisions, and help ensure governance, auditability,

Qualifications

• Minimum five years of commercial software engineering experience.
• Strong Java expertise.
• Solid understanding of streaming architectures and stateful stream processing using technologies such as Apache Beam, Apache Flink, Kafka Streams, or Spark Structured Streaming.
• Strong experience designing and building rule engines, expression evaluators, query engines, or policy/targeting systems.
• Hands-on experience with incremental computation and materialized view maintenance.
• Experience designing event-driven distributed systems with a strong focus on scalability and reliability.
• Strong knowledge of data consistency concepts, including point-in-time snapshots, exactly-once processing, idempotency, bounded staleness, and eventual consistency.
• Experience building dependency graphs, composition engines, or DAG-based processing pipelines.
• Practical experience with distributed data stores and low-latency data modeling.
• Strong knowledge of Java and Google Cloud Platform, including Pub/Sub and Apache Beam.
• Experience building correctness-critical systems with a strong focus on testing, validation, and fault tolerance.
• Understanding of versioning, rollback strategies, anomaly detection, and production safety practices.
• Upper-Intermediate English level.

Responsibilities

• Design and implement core components of the audience segmentation platform.
• Develop and evolve a flexible segment definition language for targeting scenarios.
• Build scalable evaluation engines for large-scale data.
• Implement relationship-based audience resolution across entity types.
• Optimize incremental recomputation for continuous data changes.
• Create event-driven pipelines for real-time segment accuracy.
• Ensure governance, auditability, and lifecycle traceability of segments.
• Design low-latency resolution services for high-scale operations.
• Develop caching strategies for dynamic segments and snapshots.
• Optimize system performance, scalability, and operational efficiency.
• Collaborate with product and engineering to define platform capabilities and architecture.
• Provide technical leadership and contribute to architectural decisions.

Tools

Apache Beam

Apache Flink

Kafka Streams

Spark Structured Streaming

Google Cloud Pub/Sub

Google Cloud Platform

Java

Streaming architectures

Stateful stream processing

Rule engines

Incremental computation

Event-driven systems

Data consistency

DAG-based pipelines

Distributed data stores

Testing and fault tolerance

Versioning/rollback

English

Job description

Sigma Software is seeking a Senior Java Engineer to join a real-time audience segmentation project. You will design and implement core components, including a flexible segment definition language and scalable evaluation engines.

You will drive relationship-based audience resolution, incremental recomputation, and event-driven pipelines for accuracy and performance. You will work with product and engineering teams, contribute to architecture decisions, and help ensure governance, auditability,