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KAYAK

Senior Java Software Engineer

KAYAK

. Lead the design and delivery of new direct supplier integrations, from reading partner documentation to production rollout .

Posted 10/14/2026full-timeVilnius • LithuaniaSenior💰 €3,330 - €6,660 per monthWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in designing and delivering integrations with third-party APIs, ensuring quality and reliability through effective monitoring and troubleshooting. Proficient in leading projects, mentoring engineers, and collaborating with cross-functional teams to achieve successful outcomes.

Highest-signal resume keywords
Java DevelopmentSpring FrameworkAPI IntegrationSQL Database ManagementFluent English Communication

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
JavaSpring FrameworkSQLAPI IntegrationSOAP/XMLRESTProduction System DesignTroubleshootingCode ReviewTechnical Guidance
Soft Skills
CollaborationProblem-SolvingMentoring
Tools & Technologies
AI Coding Tools
Industry Keywords
Travel DomainDirect-Connect APIsNDC APIsSupplier Testing Programs

Tech Stack

Tools & technologies
JavaSOAPSpringSQL

About the role

Key responsibilities & impact
  • Lead the design and delivery of new direct supplier integrations, from reading partner documentation to production rollout
  • Own the quality and reliability of live integrations by monitoring them, diagnosing production issues, and handling gaps between supplier documentation and real behavior
  • Evaluate user and business value before committing work and track success metrics after release
  • Build and evolve integrations with third-party APIs, including SOAP/XML, REST, and proprietary protocols
  • Design integrations across differing protocols, data models, and reliability levels while maintaining a clean, consistent internal model
  • Act as a partner contact for integration issues, investigating problems, agreeing on solutions, and following tickets through resolution
  • Write design documents, review architecture and code, and help set quality and testing standards
  • Support mid-level and junior engineers through code reviews, pairing, and technical guidance
  • Work with product, QA, and partner teams on scoping and rollout
  • Use AI coding tools in the day-to-day development workflow

Requirements

What you’ll need
  • Education in Computer Science or a related field, or equivalent practical experience
  • Significant hands-on experience with Java, including designing and operating production backend systems
  • Strong experience with the Spring framework and SQL databases
  • Experience integrating with third-party systems and working directly with their providers on communication, troubleshooting, and ticket escalation
  • Experience onboarding new partners or suppliers onto an existing platform
  • A track record of leading projects end to end and supporting the growth of other engineers
  • Fluent English communication skills
  • Comfort working in a hybrid model, with at least three office days per week
  • Bonus: Experience with airline direct-connect or NDC APIs
  • Bonus: Knowledge of the travel domain: fares, offers and orders, ancillaries, ticketing
  • Bonus: Experience with API certification or supplier testing programs
  • Bonus: Familiarity with AI coding tools and interest in using them to accelerate development

Benefits

Comp & perks
  • Work from (almost) anywhere for up to 20 days per year
  • Funds for your career growth
  • Access to thousands of on-demand e-learnings
  • Generous additional Health Insurance
  • Flexible sick time off
  • Additional financial support for your sick leave
  • Additional day off on your birthday
  • Company-wide vacation week once a year (winter holidays)
  • Additional financial support during parental leave
  • Free lunch twice a week and daily snacks at the office
  • Free yoga twice a week
  • Paid volunteering time
  • No meeting Fridays
  • Office and team events such as summer camp, KAYAK birthday, winter party and more!
  • Company-paid therapy sessions through SpringHealth
  • Company-paid subscription to HeadSpace
  • Internal Communities
  • Significant yearly bonuses, approx 10 percent of annual salary
  • Booking Holdings RSU (Restricted Stock Units) package, with possibility to receive yearly refreshes