[Skip to main content](#main-content) [OpenNash Jobs](https://jobs.opennash.com/) [Hiring report](/reports/hiring/) · [All Booking Holdings jobs](https://jobs.opennash.com/companies/booking-holdings/) · [Search jobs](/search/) Booking Holdings · Berlin # Senior Software Engineer, K4B Berlin Full-time Senior individual contributor Software Engineering Listed on Booking Holdings’s official careers site. Posted October 12, 2026. Check that it is still open and apply there. [Apply on Booking Holdings’s careers site →](https://jobs.ashbyhq.com/KAYAK/5ee0d4cd-0d78-414c-a3fa-e467287a6027) [OpenNash Jobs](https://jobs.opennash.com/) / [Booking Holdings](https://jobs.opennash.com/companies/booking-holdings/) / Senior Software Engineer, K4B ## Job description 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 ## At a glance - Posted by the employer: Oct 12, 2026 - First seen by OpenNash: Oct 17, 2026 - Last checked: Oct 17, 2026 - Listed for: 5 days - Location: Berlin - Employment type: Full-time[Apply on Booking Holdings’s careers site →](https://jobs.ashbyhq.com/KAYAK/5ee0d4cd-0d78-414c-a3fa-e467287a6027) ## More jobs at Booking Holdings ### [Associate Security Engineer](https://jobs.opennash.com/companies/booking-holdings/jobs/bd133d87ee9e1ad8d3f4/) Berlin ### [Data Scientist](https://jobs.opennash.com/companies/booking-holdings/jobs/6f209a4327a847cc6f56/) Berlin ### [Engineering Manager, K4B](https://jobs.opennash.com/companies/booking-holdings/jobs/2733bcf1cbfd4b1bb4fa/) Berlin ### [Machine Learning Engineer Manager](https://jobs.opennash.com/companies/booking-holdings/jobs/d6a78c166174fcff2841/) Berlin ### [Marketing Manager - Germany](https://jobs.opennash.com/companies/booking-holdings/jobs/e9a005ce7f850e91fd50/) Berlin ## Similar jobs at other companies ### [Full Stack Software Engineer II and Senior Software Engineer- Microsoft Security - Multiple roles](https://jobs.opennash.com/companies/microsoft/jobs/ce8bde6800315a9405e1/) Microsoft · Israel, Multiple Locations ### [Lead Software Engineer, Software Defined Storage](https://jobs.opennash.com/companies/sandisk/jobs/82c3291c960f66baa772/) Sandisk ### [Staff Software Test Engineer/Software Test Lead](https://jobs.opennash.com/companies/thermo-fisher-scientific/jobs/457bdc55eab7538b5b89/) Thermo Fisher Scientific · Singapore ### [Staff Software Engineer – Host & Secure Compute Software - Cork, Ireland](https://jobs.opennash.com/companies/qualcomm/jobs/d5d830fb764fadb851b4/) Qualcomm · Cork, Ireland ### [Software Engineer, Software Development Engineering (Apps) 3-6 years - Artifactory](https://jobs.opennash.com/companies/sandisk/jobs/14f1b9e58a1e3e67456f/) Sandisk OpenNash lists jobs from employers’ own careers sites and does not handle applications. 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