Senior Software Systems Engineer with Java

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

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 Senior Software Systems Engineer to join our global Order Management team, where innovation knows no borders. This team delivers core transaction capabilities for the Sabre Smart Retailing Engine, powering personalized offers across the modern travel ecosystem. It engineers high-scale, low-latency and high-throughput systems that differentiate Sabre in the marketplace. With an inclusive culture and flexible work environment, we work together with boldness, curiosity and commitment so we can all win together.

As a Senior Software Systems Engineer, you will design, build and deploy mission-critical microservices in a cloud-native architecture. You will refactor complex codebases, advance system stability and champion engineering excellence through collaborative, sustainable ways of working. This role requires technical rigor, sound architectural judgment and practical experience applying modern engineering practices to deliver resilient distributed solutions.

What you'll do

• 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

What you'll bring

Required 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

Preferred qualifications

• Domain knowledge in Order Management Systems (OMS) or airline and travel operations, including orders, PNRs, payments or booking servicing
• Experience with build and dependency management using Maven and Bazel in a monorepo setup
• Solid experience with relational databases and distributed or NoSQL data stores, with Google Cloud Spanner being especially relevant
• Experience designing event-driven systems using Google Cloud Pub/Sub
• Experience building and integrating APIs, particularly gRPC with Protocol Buffers and REST with JSON
• Experience with cloud deployments and containers, with Google Cloud Platform and Kubernetes/GKE preferred
• Experience with Terraform and cloud infrastructure
• Familiarity with application security standards, including OAuth 2.0/JWT and Okta integration, as well as Envoy and cloud-native load balancing concepts

Work arrangements

• Hybrid working mode; 3 chosen days from the office in a week
• Flexible working hours: Maintain your work-life balance by adjusting your working hours to your needs

Paid time off

• Year-End-Break: enjoy additional fully paid days off during the last week of the year
• Paid parental leave: Take up to 12 weeks off with pay after birth or adoption of a child. Sabre Global Paid Parental Leave runs concurrently with local leave policies.
• Paid volunteer time: take up to 4 days annually to give your time to a charitable organization of your choice

Your money

• My Benefit platform/Multisport card: enjoy the benefit cafeteria system and use popular sport card
• Tax deduction: take the opportunity to claim deductible costs, reducing your income tax
• Employee Capital Plans: profit from long‑term saving scheme co-financed by Sabre and the State Treasury
• Baby Bonus: benefit from one-time allowance on childbirth or adoption
• Say Thanks program: collect points on recognition program and transfer them to wide variety of gifts and services

Health and wellness

• Luxmed medical coverage: take care of yourself and your family with the extensive medical package with a broad range of additional services
• Foreign travel insurance: feel safe going abroad with free Allianz insurance offered as part of our Lux Med package
• Employee Assistance Program: find help in free, confidential program with a certified counselor
• Mindfulness & meditation apps: take care of your mental and physical health
• Life insurance: sign up for free, high coverage life insurance program

Career development

• Professional development: access to e-learning platforms as well as join Sabre live learning sessions
• Certification and tuition reimbursement
• Our Communities: join one of our team member groups focused on sharing knowledge and best practices (Google Developers Group, Innovation Lab Community, Women in Technology, SOLVE!T and many more)

And more

• Car and bike parking
• Fun & Relax zone in modern office: enjoy electronic tables to work, foosball, ping pong, pool table, swings, massage chairs and terraces to admire a panoramic view of Kraków. We have parents’ rooms as well
• No dress code
• Innovation Lab: access Augmented Reality & Virtual Reality equipment, Robot construction kit, 3D printers and many more
• Attractive Referral Bonus: earn $2500 USD for every hired referral

We will give careful consideration to your application and review your details against the position criteria. You will receive separate notification as we progress your application.

Please note that only candidates who meet the minimum requirements will proceed in the selection process.

Sabre is an equal employment opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, sex, gender identity, sexual orientation, disability status, protected veteran status or any other characteristic protected by law.