Principal Engineer - Service Delivery/IX Platform

Sabre is an AI-native technology leader providing cloud-native backend services and distributed architectures for travel and airline technology solutions. The IX Platform team in Kraków designs, builds, and evolves mission-critical systems that enable travel retailing, distribution, and fulfillment at scale worldwide.

• Strong hands-on experience with Java backend development, modern JDK versions, JVM fundamentals, concurrency, and performance tuning.
• Proven experience designing, developing, consuming, and maintaining REST and SOAP APIs, including API security, contracts, and versioning.
• Practical experience with cloud-native architectures and containerization tools such as Docker, Kubernetes, and Google Cloud Platform services.
• Solid understanding of distributed systems principles, microservices patterns, service discovery, resiliency mechanisms including retries, timeouts, circuit breakers, idempotency, consistency, latency, and failure handling.
• Hands-on experience with relational databases, SQL schema design, query optimization, and data modeling.
• Experience with modern CI/CD practices.

Nice to have:

• Experience with Spring Boot, Spring Cloud, or similar Java backend frameworks.
• Hands-on experience with GCP-native services such as GKE, Pub/Sub, BigQuery, Cloud SQL, Memorystore, Cloud Logging, Cloud Monitoring, Cloud Trace, or Cloud Build.
• Experience with Kafka or high-volume event streaming platforms.
• Experience designing systems for high availability, horizontal scaling, disaster recovery, and handling performance under load.
• Experience with OpenAPI/Swagger, API gateways, OAuth2/OIDC, JWT, mTLS, enterprise identity integrations.
• Familiarity with Infrastructure as Code tools such as Terraform or Helm.
• Domain experience in travel, airline, retailing, distribution, booking, or fulfillment enterprise systems.

Service Lifecycle:

• Take ownership of services from design through implementation, deployment, and production support.

Backend Engineering:

• Design, develop, test, and maintain high-performance backend services using Java and modern JDK features.

API Development:

• Build, consume, and document secure, well-structured RESTful and SOAP APIs including security, contracts, and versioning.

Cloud Operations:

• Deploy and operate containerized microservices using Docker, Kubernetes, on Google Cloud Platform (GKE, Cloud Run).

Distributed Systems:

• Implement asynchronous, event-driven communication with messaging technologies like Pub/Sub, Kafka, RabbitMQ.

Data Management:

• Optimize relational database schemas, SQL queries, transactions, caching, and data access layers.

Quality & Code Health:

• Write production-quality code with unit and integration tests, participate in code reviews, and improve engineering practices.

Cross-Functional Collaboration:

• Work with Product, Architecture, QA, SRE, and Delivery teams to refine technical requirements and support operational readiness including logging and monitoring.