Senior Java Systems Engineer — Cloud-Native Microservices

Sabre Corporation; Kraków; Hybrid; PLN 210,000 - 360,000; Full time

Benefits offered by this job

Luxmed medical coverage

Flexible working hours

Hybrid work model

Office in Kraków

Referral bonus

Job summary

Sabre Corporation in Kraków is seeking a Senior Software Systems Engineer to join the global Order Management team, delivering high-scale microservices in a cloud-native environment and driving resilient, maintainable software. You will refactor code, raise system stability, and collaborate across Agile teams while embracing AI-assisted tools like GitHub Copilot to accelerate delivery.

The role requires 5+ years of Java backend experience, strong Spring Boot expertise and a disciplined approach

Qualifications

• At least 5 years of hands-on Java backend development experience, including recent production experience with Java 17 or later (familiarity with Java 21 is an advantage)
• Strong knowledge of the Java ecosystem, Spring Boot and designing and building microservices
• Solid understanding of distributed systems principles, including service boundaries, asynchronous messaging, consistency, failure handling, resilience and observability
• Comprehensive knowledge of the end-to-end software development lifecycle (SDLC), from requirements and system design through implementation, testing, code review, CI/CD, deployment and production support
• Hands-on experience with automated testing frameworks such as JUnit 5, Mockito and AssertJ
• Practical experience working in Agile or Lean software development teams
• Demonstrated experience using AI tools effectively for code exploration, implementation, testing, documentation and debugging, including experience introducing AI-assisted engineering practices or evaluating their delivery impact
• Excellent communication skills in both English and Polish

Responsibilities

• Design, build and deploy high-scale, low-latency microservices using Google Cloud Platform
• Translate user stories into robust, production-ready code with strong automated test coverage
• Refactor complex areas of the codebase to continuously improve maintainability and performance
• Develop and maintain clear software technical documentation to support engineering alignment
• Partner across Agile teams to address feedback, resolve technical blockers and deliver enhancements
• Identify and implement engineering solutions that improve application performance, resilience and stability
• Leverage AI-assisted development tools such as GitHub Copilot to accelerate implementation, testing and debugging

Skills

Java backend development

Java 17+

Spring Boot

Microservices

Distributed systems

SDLC

JUnit 5 / Mockito / AssertJ

Agile teams

English & Polish

AI tools for code

Tools

Google Cloud Platform

Kubernetes

Maven

Bazel

GitHub Copilot

REST & gRPC

Job description

Sabre Corporation in Kraków is seeking a Senior Software Systems Engineer to join the global Order Management team, delivering high-scale microservices in a cloud-native environment and driving resilient, maintainable software. You will refactor code, raise system stability, and collaborate across Agile teams while embracing AI-assisted tools like GitHub Copilot to accelerate delivery.

The role requires 5+ years of Java backend experience, strong Spring Boot expertise and a disciplined approach