Principal Software Systems Engineer in Kraków

We are seeking a

Software Systems Engineer

to join our global engineering team, where innovation knows no borders. This team designs and delivers resilient, high-throughput cloud services that power critical travel transactions across the globe. By building modern distributed systems, the team ensures our platform operates with exceptional performance, scalability and reliability. With an inclusive culture and flexible work environment, we work together with boldness, curiosity and commitment so we can all win together.

What You’ll Do

Provide technical leadership and architectural direction for distributed backend microservices within an Agile/Lean monorepo environment

Design and implement high-performance service-to-service APIs, event-driven integrations and scalable data architectures

Own the full software development lifecycle from technical design through code reviews, automated testing, CI/CD and production diagnostics

Guide development teams in modern testing standards, observability, resilience patterns and failure handling to safeguard production stability

Introduce and evaluate AI-assisted engineering practices, using tools such as GitHub Copilot to improve code exploration, quality, testing and delivery speed

Collaborate with cross-functional teams to align service boundaries, optimize infrastructure with Terraform and container orchestration, and ensure robust security standards

What You’ll Bring Required qualifications

At least 6 years of hands-on Java backend development experience, including recent production experience with Java 17 or later

Deep expertise across the Java ecosystem, Spring Boot and the design of cloud-native microservices

Proven track record leading development teams or serving as a technical anchor in Agile/Lean delivery environments

Strong foundation in distributed systems, covering asynchronous messaging, service boundaries, consistency, failure handling and observability

Solid grasp of the end-to-end SDLC, including CI/CD automation, testing frameworks such as JUnit 5, Mockito and AssertJ, code reviews and production support

Practical experience applying AI tools effectively for code implementation, testing, debugging and documentation, along with evaluating their delivery impact

Excellent communication skills in English

Preferred Qualifications

Familiarity with Java 21

Domain experience in Order Management Systems (OMS) or travel/airline operations, including orders, PNRs, payments or booking servicing

Experience managing builds and dependencies with Maven and Bazel within a monorepo

Experience working with Google Cloud Platform, Google Cloud Spanner and distributed or NoSQL data stores

Practical experience with Google Cloud Pub/Sub, event-driven architectures and message-driven workflows

Hands‑on experience developing or integrating APIs using gRPC, Protocol Buffers and REST/JSON

Familiarity with containerized cloud deployments on Kubernetes/GKE, infrastructure as code via Terraform, Envoy service‑mesh concepts or OAuth 2.0/Okta security

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 additionalfully paid days offduring 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

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