Search jobs Explore companies My job alerts Senior Software Engineer, K4B KAYAK Software Engineering • Full-time Berlin, MD, USA Posted on Oct 13, 2026 Apply now KAYAK, part of Booking Holdings (

NASDAQ:

BKNG), is the world's 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 at our core 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. We are looking for a strong Java backend developer to implement new features and maintain KAYAK's world-leading search and booking technology. We integrate with over 200 travel partners and link to over 500,000 hotels and 550 airlines. You will be an essential part of a high powered team that keeps all of this running smoothly - helping millions of people find the best hotels and the best ways to fly from A to B every day! In this role you will be expected to work from our Berlin office at least 3 days per week . In this role, you will: Optimize search and booking logic to handle the demands of greatest global corporate clients Build and maintain high-performance integrations with third-party APIs (airlines, hotel and rentalcars providers) Take full ownership of your designs: from initial concept to deployment while maintaining high standards for code quality and performance Participate in code reviews and architectural steering to ensure the K4B project remains modular and reusable as KAYAK expands its enterprise footprint Please apply if you have: Bachelor's degree or higher in Computer Science or related field 6+ years of experience in JAVA Hands-on experience with the Spring ecosystem (Spring/Spring Boot) and working knowledge of relational (SQL) and NoSQL databases (e.g., PostgreSQL, MySQL, Redis). Strong English communication skills Ability to design and implement engineering initiatives with minimal guidance Prior experience in the travel domain is beneficial — familiarity with airline distribution and standards (GDS such as Amadeus/Sabre/Travelport, NDC) and their integration with booking/reservation systems. Experience with B2B systems or identity/HR integrations is beneficial — e.g., SCIM, SAML/OAuth, SSO, user provisioning/deprovisioning, and connecting

HRIS/IDP

platforms (Workday, Okta, Active Directory) to product services.

Benefits and Perks:

Work from (almost) anywhere for up to 20 days per year Focus on mental health and well-being: Company-paid therapy sessions through SpringHealth Company-paid subscription to HeadSpace Company-wide week off a year - the whole team fully recharges (and returns without a pile-up of work!) No meeting Fridays Paid parental leave Paid volunteer time Focus on your career growth: Development Dollars Leadership development Access to thousands of on-demand e-learnings Travel Discounts Employee Resource Groups 6 weeks paid vacation + a day off for your birthday Free lunch 2 days per week Pension plan contributions Public transportation subsidies Bike leasing program Monthly social events, Thursday happy hours, sports teams An awesome office in Friedrichshain, Berlin Inclusion At KAYAK, we want everyone to have the space to grow, share ideas and do great work. That's why we're focused on hiring the best talent from all walks of life and experiences, supporting them well and making sure no one feels like they have to fit a mold to belong here. Need any adjustments for the interview, application or on the job? No problem - just give us a heads-up. We've got you. #LI-AS1 Apply now See more open positions at KAYAK