Senior Java Engineer

About the Role Senior Java Engineer to join a real-time audience segmentation and engagement platform at Sigma Software. This remote role is open to candidates from Ukraine and Europe, offering the opportunity to work with cutting-edge technologies and high-scale systems.

You will be part of a team building a platform that powers communications, personalization, automation, and customer engagement across diverse ecosystems.

What You'll Do

• Design and implement core components of the audience segmentation platform.
• Develop and evolve a flexible segment definition language supporting complex targeting scenarios.
• Build scalable evaluation engines for processing large-scale entity and relationship data.
• Implement relationship-based audience resolution across multiple 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 teams to define platform capabilities and architecture.
• Provide technical leadership and contribute to architectural decisions.

What We're Looking For

• At least 5+ years of backend engineering experience.
• Strong Java expertise.
• Proven experience building distributed systems.
• Knowledge of query engines, search platforms, rules engines, segmentation platforms, or analytics systems.
• Strong understanding of data modeling and domain-driven design principles.
• Experience with event-driven architectures.
• Skilled in designing scalable APIs and backend services.
• Strong problem-solving and performance optimization skills.
• Experience with cloud-native architectures.
• Ability to drive technical decisions and contribute to system architecture.
• Upper-Intermediate+ English.

Nice to Have

• Experience with recommendation engines.
• Knowledge of Quarkus.
• Experience building Customer Data Platforms (CDP).
• Experience with marketing automation systems.
• Expertise in audience segmentation or personalization platforms.
• Familiarity with graph-based data models and relationship traversal.
• Experience with search technologies (Elasticsearch, OpenSearch).
• Experience with stream processing technologies.
• Experience with Google Cloud Platform.
• Experience with large-scale analytics systems.

Compensation & Benefits

• Salary: Not disclosed.
• Benefits and perks: Not disclosed.