KAYAK, part of Booking Holdings (NASDAQ: BKNG), is a leading travel search engine. With billions of queries across our platforms, we help people find their perfect flight, stay, rental car and vacation package. We're also transforming business travel with a new corporate travel solution, KAYAK for Business.

As an employee of KAYAK, you will be part of a travel company that operates a portfolio of global metasearch brands including momondo, Cheapflights and HotelsCombined, among others. From start-up to industry leader, innovation is in our DNA and every employee has an opportunity to make their mark. Our focus is on building the best travel search engine to make it easier for everyone to experience the world.

At KAYAK for Business (K4B), we're building the future of corporate travel technology — and the engineering teams behind it are at the heart of that mission. Our K4B engineering team in Kaunas is growing, and we're looking for a Senior Java Backend Developer to help design, build, and own the systems behind search, booking, and servicing. We connect to global distribution systems (GDS) and airline content that power fares, availability, pricing, and ticketing for companies and their business travelers. You will help shape the team's technical direction, take on some of our hardest integration and performance problems, and support other engineers as they grow.

This role requires working from our Kaunas office at least 3 days per week.

In this role you will

Lead the design and delivery of backend features for flight search, pricing, and booking across GDS and other travel-supplier integrations.

Own the reliability and performance of high-traffic services — diagnosing production issues and improving latency, throughput, and cost per search.

Evaluate the user and business value of work before committing to build, and track success metrics after release.

Build and evolve integrations with third-party APIs (SOAP/XML, REST, and proprietary protocols), handling their quirks, rate limits, and failure modes.

Act as a point of contact with partners on integration issues: investigate problems, agree on solutions, and follow tickets through to resolution.

Contribute to technical decisions: write design documents, review architecture and code, and help set standards for quality and testing.

Support mid-level and junior engineers through code reviews, pairing, and technical guidance, and work with product, QA, and partner teams on scoping and rollout.

Use AI coding tools as part of your day-to-day workflow — AI-assisted development is a normal part of how our team works.

Please apply if you have

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.

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 skills

Experience with Kubernetes, including containerizing and deploying backend services.

Hands-on experience with GDS platforms (Amadeus, Sabre, Travelport) or airline NDC/direct-connect APIs.

Knowledge of the airline domain: fares, PNRs, ticketing, fare rules, availability.

Familiarity with AI coding tools and interest in using them to accelerate development.

Benefits and 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