Principal Software Systems Engineer

Location: Krakow, Małopolskie, Poland; hybrid work with 3 chosen office days per week

Company

hirify.global is an AI-native travel technology company providing open, modular, cloud-native systems for airlines, hoteliers, agencies, and other travel partners.

What you will do

• Provide technical leadership and architectural direction for distributed backend microservices in an Agile/Lean monorepo environment.
• Design and implement high-performance service-to-service APIs, event-driven integrations, and scalable data architectures.
• Own the software development lifecycle from technical design through code reviews, automated testing, CI/CD, and production diagnostics.
• Guide teams on testing standards, observability, resilience patterns, and failure handling to protect production stability.
• Introduce and evaluate AI-assisted engineering practices, including tools such as GitHub Copilot.
• Collaborate across functions on service boundaries, Terraform-based infrastructure, container orchestration, and security standards.

Requirements

• At least 6 years of hands-on Java backend development experience, including recent production experience with Java 17 or later.
• Deep expertise in the Java ecosystem, Spring Boot, and cloud-native microservices.
• Experience leading development teams or acting as a technical anchor in Agile/Lean delivery environments.
• Strong knowledge of distributed systems, including asynchronous messaging, service boundaries, consistency, failure handling, and observability.
• Solid understanding 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 using AI tools for implementation, testing, debugging, and documentation, and evaluating their delivery impact.
• Excellent communication skills in English.

Nice to have

• Familiarity with Java 21.
• Experience with Order Management Systems or travel and airline operations, including orders, PNRs, payments, or booking servicing.
• Experience with Maven and Bazel builds and dependency management in a monorepo.
• Experience with Google Cloud Platform, Google Cloud Spanner, and distributed or NoSQL data stores.
• Experience with Google Cloud Pub/Sub, event-driven architectures, and message-driven workflows.
• Experience developing or integrating APIs with gRPC, Protocol Buffers, and REST/JSON.
• Familiarity with Kubernetes/GKE, Terraform, Envoy service mesh concepts, or OAuth 2.0/Okta security.

Culture & Benefits

• Hybrid working mode with 3 office days per week and flexible working hours.
• Paid year-end break, up to 12 weeks of paid parental leave, and up to 4 paid volunteer days annually.
• Medical coverage, foreign travel insurance, life insurance, employee assistance, and wellness apps.
• Benefit cafeteria, Multisport card, tax deductions, employee savings plans, baby bonus, and recognition rewards.
• Professional development through e-learning, live learning, certifications, tuition reimbursement, and knowledge-sharing communities.
• Office facilities include parking, a recreation zone, parents’ rooms, innovation equipment, and no dress code.

Hiring process

• Applications are reviewed against the position criteria.
• Only candidates meeting the minimum requirements proceed in the selection process.