We are looking for a Senior Java Engineer to join the Segmentation & Audience Platform project full-time. We are building a real-time Audience Segmentation & Engagement Platform that powers communications, personalization, automation, reporting, and customer engagement across the entire ecosystem.
Your responsibilities will include: * Design and implement core components of the audience segmentation platform * Design and evolve a flexible segment definition language supporting complex rules and targeting scenarios * Build a scalable segment evaluation engine for processing large-scale entity and relationship data * Support complex nested logical expressions, filtering criteria, and rule evaluation workflows * Implement relationship-based audience resolution across multiple entity types and organizational hierarchies * Design and optimize incremental segment recomputation to efficiently process continuous data changes * Build event-driven audience update and hydration pipelines for near real-time segment accuracy * Implement segment versioning, governance, auditability, and full lifecycle traceability * Design low-latency audience resolution services operating at high scale * Develop materialization and caching strategies for dynamic segments and audience snapshots * Optimize query execution, system performance, scalability, and operational efficiency * Design and evolve APIs for audience creation, management, and retrieval * Collaborate with product and engineering teams to define platform capabilities and architecture * Ensure reliability, observability, maintainability, and operational excellence of the platform * Contribute to architectural decisions and provide technical leadership within the team
What we expect from you: * At least 5 years of backend engineering experience * Strong Java development expertise * Experience building distributed systems * Experience designing 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 * Experience designing scalable APIs and backend services * Strong problem-solving and performance optimization skills * Experience working with cloud-native architectures * Ability to drive technical decisions and contribute to system architecture * Upper-Intermediate+ English level
Will be a plus: * Experience with recommendation engines * Experience with Quarkus * Experience building Customer Data Platforms (CDP) * Experience with marketing automation systems * Experience with audience segmentation or personalization platforms * Experience with graph-based data models and relationship traversal * Experience with search technologies such as Elasticsearch or OpenSearch * Experience with stream processing technologies * Experience with Google Cloud Platform * Experience with large-scale analytics systems
What We Offer: * Work at a Top-employer company (according to DOU 2025) * A strong culture built on empathy, trust, openness, and real care for employees * Competitive compensation with regular reviews * Medical insurance * Personal learning budget and access to top HR tools, platforms, and practices * Team events and regular team-building activities * Flexible hybrid work model with an office in central Kyiv
