---
title: 'Senior Software Engineer, K4B at KAYAK'
canonical: 'https://feeny.ai/job/senior-software-engineer-k4b-kayak-concord-3ht3dnt6yevk'
type: 'job'
last_seen: '2026-09-12'
---

# Senior Software Engineer, K4B at KAYAK

- **Company:** KAYAK
- **Location:** Concord
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-07
- **Last confirmed live:** 2026-09-12
- **Apply:** https://jobs.ashbyhq.com/kayak/57dbb064-20d9-403b-a6ea-0a340c508aa8

## 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 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. We are looking for a strong Senior Java Software Engineer to implement new features and maintain KAYAK’s world-leading platform. We are seeking for people who love working with data - parsing, analyzing, investigating, interpreting, modeling, and extracting knowledge from large volumes of data. Good candidates will have a passion in processing data to help drive better business decisions or to develop new features, in a fast-paced environment where many small and diverse projects are the norm. This role will be required to work from our Concord, MA office at least 3 days per week.

In this role, you will:

- Extract data from databases, write scripts to parse, clean, combine, and process them
- Communicate with APIs via REST or SOAP interfaces.
- Configure enterprise applications for large customers.
- Develop tools to assist in the debugging of existing products.
- 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:

- +6-8 years of experience with Java programming
- Strong understanding of programming fundamentals, data structures, algorithms, and software design
- Ability to work independently and with a team
- Good communication skills for sharing ideas clearly with both technical and non-technical colleagues
- Experience with relational databases like MySQL or Oracle
- Prior experience in the travel domain is beneficial
- 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.
- Experience with the following:
- Unix shell scripting
- Spring & Mybatis frameworks
- DOM and using XPath, JQuery & CSS
- API development using REST, Web Service, SOAP, etc
- Machine Learning

## 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
- Generous paid vacation + time off for your birthday
- Paid volunteer time
- Focus on your career growth:
- Development Dollars
- Leadership development
- Access to thousand of on-demand e-learnings
- Travel Discounts
- Employee Resource Groups
- Competitive retirement and health plans
- Free lunch 2 days per week
- Fun quarterly events such as boat trips, arcades, ski trips, Thursday socials, and more

There are a variety of factors that go into determining a salary range, including but not limited to external market benchmark data, geographic location, and years of experience sought/required. The range for this Massachusetts based role is $125,000-140,000, not inclusive of annual bonus and recurring RSU grants. We offer a competitive base salary and benefits including: health benefits; flexible spending account; retirement benefits; life insurance; paid time off (including PTO, paid sick leave, medical leave, bereavement leave, floating holidays and paid holidays); and parental leave benefits.

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

## About KAYAK

## Company Overview
- **One-liner**: KAYAK is the world’s leading travel metasearch engine, enabling travelers to compare flights, hotels, rental cars, and vacation packages from hundreds of sites in one place.
- **Entity Type**: Private (subsidiary of Booking Holdings Inc., NASDAQ: BKNG)
- **Headquarters**: Stamford, Connecticut, USA (with 15 international offices)
- **Founded**: 2004
- **Founders**: Steve Hafner (former CEO until February 2026) and Paul English

## Core Business
- **Primary industry/industries**: Online travel, travel technology, metasearch.
- **Target customers**: B2C (leisure and business travelers) and B2B (travel providers, advertisers, and corporate clients via KAYAK for Business).
- **Mission or purpose statement**: To help travelers make confident travel decisions by providing transparent, comprehensive search results that put control back in their hands. KAYAK believes “travel makes the world better.”

## Products & Services
- **KAYAK Metasearch**: Core product allowing comparison of flights, hotels, rental cars, and vacation packages from hundreds of travel sites.
- **KAYAK for Business (K4B)**: Free corporate travel solution for business travelers.
- **KAYAK Mobile App**: iOS and Android app offering seamless travel planning, price forecasts, price alerts, trip management, and AI-powered search.
- **KAYAK.ai**: AI-powered travel assistant providing personalized tips, live pricing, and conversational booking.
- **Explore Tool**: Inspires spontaneous travel by showing destinations within a chosen budget.
- **Trips**: Personal travel assistant for organizing, managing, and sharing itineraries with real-time flight status.
- **Price Forecast & Alerts**: Predicts price trends and notifies users of changes for flights, hotels, and car rentals.
- **KAYAK for Partners & Advertisers**: Commission-based and advertising revenue models.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed as a subsidiary; parent Booking Holdings has a market cap of ~$150+ billion (as of mid-2025).
- **Key Metric**: Processes billions of searches annually; 800+ team members; 60+ international sites in 25+ languages.
- **Notable Investors/Partners**: Owned by Booking Holdings, Inc. (NASDAQ: BKNG), which acquired KAYAK in 2013. Partners with hundreds of airlines, hotels, online travel agencies, and car rental companies.
- **Growth Signals**: 
  - Named #1 Best Airfare Search Site by Frommer’s (2024, 2025).
  - Won World’s Best Flight & Hotel Comparison Website at World Travel Tech Awards (2022–2024).
  - Recognized by Statista & COMPUTER BILD as a Top Online Platform 2025.
  - First mainstream travel company to introduce AI-powered conversational search (KAYAK AI Mode).
  - Expanded portfolio of 7 travel search brands globally.

## Competitive Advantages
- **First-mover in travel metasearch**: Pioneered the concept in 2004, creating a trusted, comprehensive comparison platform.
- **Unbiased results**: Displays fares from all major providers without favoritism, clearly labeling booking sources.
- **Massive data advantage**: Processes billions of searches, enabling powerful AI/ML tools like Price Forecast and AI Mode.
- **Global brand portfolio**: Manages 7 brands (KAYAK, SWOODOO, checkfelix, momondo, Cheapflights, Mundi, HotelsCombined) with a global footprint.
- **Strong financial backing**: Part of Booking Holdings, providing stability and resources for innovation.
- **High trust & recognition**: Consistently ranked #1 by leading travel publications and awards.

## Strategic Focus
- **AI & personalization**: Leading with AI-powered search and conversational planning to improve user experience.
- **Expanding corporate travel**: Growing KAYAK for Business as a free, self-service corporate travel tool.
- **Global scale**: Continuing to expand international sites and language support.
- **Innovation in search tools**: Developing new features like Price Forecast, Explore, and real-time trip management.
- **Maintaining transparency**: Strengthening trust through clear labeling and fair marketplace practices.

## Why Work Here
- **Culture**: Mission-driven, data-obsessed team of 800+ passionate about travel technology; emphasis on career growth, skill development, and individual learning.
- **Work policy**: Hybrid model – team members work from the office three days a week, with flexibility to come in more often. Some roles are fully remote (US-based).
- **Perks**: Part of a global network including OpenTable and a portfolio of travel metasearch brands; employee-resource groups for under-represented communities; global equal-pay policy.
- **Engineering culture**: Strong focus on data, AI, and scalable systems (billions of queries); tech stack includes modern Java, frontend frameworks, and ETL tools.
- **Global opportunities**: 15 international offices with opportunities to work across teams.
- **Recognition**: Named a top employer by Built In and industry awards.
- **Caution**: KAYAK warns of fraudulent job ads – all genuine recruitment ends with @kayak.com, and no payment is ever requested from candidates.

## Sources
1. [kayak.com](https://www.kayak.com/careers/)
2. [kayak.com](https://www.kayak.com/about)
3. [kayak.com](https://www.kayak.com/c/help/about/)
4. [builtin.com](https://builtin.com/company/kayak)
5. [linkedin.com](https://www.linkedin.com/company/kayak)

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