Senior Frontend Software Engineer

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. Trade your daily grind for a career that lets you show off your passion for travel! Join KAYAK to build the travel tools that our users dream of, and develop your own ideas during our Hack Weeks. Be the first to play with new and innovative travel features (while getting paid for it). We are looking for smart, ambitious, and hardworking developers with a passion for learning and delivering. You will join our Full Stack KAYAK4Business team in Massachusetts, responsible for user experiences that are the face of KAYAK for millions of users every day. You will work closely with other teams, developing innovative features to make shopping for travel simple. If you're an engineer who loves traveling, and wants to help shape the future of the travel meta, we'd love to hear from you! This role will be required to work from our Concord, MA office 3 days per week.

In this role you will:

Work on K4B product features used by millions of corporate travelers Have end-to-end ownership of the UI, including testing, monitoring and troubleshooting Make architectural decisions and build prototypes Review and scope feature requests Drive technical debt reduction, oversee code quality, and pair with other developers Refactor and optimize existing code Work with geographically distributed teams Leverage modern AI tools & technologies to build excellent user interfaces Please apply if you have: 4+ years of meaningful work experience building web applications Bachelor's degree or higher, preferably in a quantitative/technical field (e.g. Computer Science, Engineering, Physics, Math) Deep experience building layouts using CSS and HTML Advanced understanding of JavaScript, ideally with some experience using a modern UI framework or library (we use React, but Angular and Vue.js experience counts) Knowledge of performance considerations, especially with respect to browsers Experience working in Java, C#, or a similar object-oriented language Experience leveraging AI tools (Claude Code, Codex, Cursor or similar) to building high quality software solutions Ability to… Debug issues in a full-stack environment Work independently on solutions and designs with minimal oversight Produce scalable, high quality, and accurate work Estimate effort accurately and execute with pace Show good judgment in architecting software Use metrics to validate decision-making Owns communication to key stakeholders on assigned projects Easily relate technical subjects to non-technical audiences Demonstrate leadership across teams and business functions 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 thousands 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 $140,000 - 160,000.00 , 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.