Kayak

Senior Software Engineer, K4B

Berlin Office, Germany full-time Mid Salary not listed
full-time Mid level Technology & IT Curated
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About the role

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.
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Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Mid
Technology & IT API integration Human Resources MySQL SQL Mid level full-time

Likely questions

  1. Tell us about work you have done that is close to the Senior Software Engineer, K4B role.
  2. How would you approach your first 30 days at Kayak?
  3. Which of API integration, Human Resources and MySQL have you used recently, and what did it help you achieve?
  4. Describe a time you solved a problem without waiting to be told exactly what to do.
  5. How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

  • A recent example that proves your experience with API integration, Human Resources and MySQL.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Senior Software Engineer, K4B role because I can bring practical experience in API integration, Human Resources and MySQL, learn the team quickly, and contribute to the outcomes Kayak needs from this hire.

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