Software Systems Engineer — Contributor, IX Platform

Powering the agentic revolution in travel. Sabre is an AI-native technology leader, backed by one of the world’s largest travel data clouds. Built on an open, modular, cloud-native architecture, Sabre serves as the backbone for both established leaders and bold, new disruptors, guiding them to the next age of travel retailing through intelligent, connected, and personalized experiences. With AI at its core and operating at unparalleled scale, Sabre transforms insights into innovation, empowering airlines, hoteliers, agencies and other partners to retail, distribute and fulfill travel worldwide. We are seeking a Systems Engineer — Contributor to join our global IX Platform team , where innovation knows no borders. This team builds and maintains high-scale backend services and cloud-native platform capabilities for enterprise travel and airline technology solutions. As part of a newly created team in Kraków, it delivers foundational microservices, APIs and data flows that power core retailing and fulfillment workflows. With an inclusive culture and flexible work environment, we work together with boldness, curiosity and commitment so we can all win together. You will focus on hands-on backend development using Java, modern cloud components and microservice architectures. Working under the guidance of senior engineers and architects, you will build, test and maintain production-quality software while expanding your technical skills across distributed systems. You will work on well-defined engineering assignments, gradually increasing your ownership as you build deeper platform and domain expertise. This role requires strong engineering discipline, natural curiosity, clear communication and a drive to build scalable software. What You'll Do Backend Engineering: Develop, test and maintain backend services using Java and modern JDK features following established engineering practices. API Development: Build, extend and document RESTful APIs based on defined contracts, technical designs and error-handling standards. Microservices Architecture: Contribute to microservice architectures, focusing on service logic, configuration, communication patterns and deployment readiness. Cloud Infrastructure: Work with cloud-native technologies within Google Cloud Platform, including containerized services, managed cloud components, logging and deployment pipelines. Event-Driven Systems: Implement and maintain messaging and event-driven components using queues, event streams and asynchronous processing. Data Persistence: Develop database access logic and write SQL queries across relational and NoSQL databases to support data consistency and performance. Testing & Quality: Write unit, integration and component tests, fix defects and actively participate in code reviews to maintain high quality. Support & Debugging: Support investigation and debugging of production and integration issues using logs, monitoring tools, API traces and database queries, with…