{"id":2355324,"url":"https://alion.io/job/kayak-senior-software-engineer-k4b-2","title":"Senior Software Engineer, K4B","company":{"id":3573,"name":"KAYAK","domain":"kayak.com","url":"https://alion.io/company/kayak","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"C","score":69,"open_postings":4,"ghost_share":0.25,"stale_share":0.5,"repost_share":0.25,"time_to_fill_p50_days":41,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Berlin, Germany"],"countries":["DE"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":60000,"max_usd":105000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":59},"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Active Directory","optional":false},{"name":"Java","optional":false},{"name":"MySQL","optional":false},{"name":"Okta","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Redis","optional":false},{"name":"Spring Boot","optional":false},{"name":"SQL","optional":false}],"status":"live","first_seen_at":"2026-10-12T12:40:00Z","employer_posted_date":"2026-10-12","last_verified_at":"2026-10-12T19:24:37Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"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.\nAs 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.\nWe 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!\nIn this role you will be expected to work from our Berlin office at least 3 days per week.\nIn this role, you will:\nOptimize search and booking logic to handle the demands of greatest global corporate clients\n\nBuild and maintain high-performance integrations with third-party APIs (airlines, hotel and rentalcars providers)\n\nTake full ownership of your designs: from initial concept to deployment while maintaining high standards for code quality and performance\n\nParticipate in code reviews and architectural steering to ensure the K4B project remains modular and reusable as KAYAK expands its enterprise footprint\n\nPlease apply if you have:\nBachelor’s degree or higher in Computer Science or related field\n\n6+ years of experience in JAVA\n\nHands-on experience with the Spring ecosystem (Spring/Spring Boot) and working knowledge of relational (SQL) and NoSQL databases (e.g., PostgreSQL, MySQL, Redis).\n\nStrong English communication skills\n\nAbility to design and implement engineering initiatives with minimal guidance\n\nPrior 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.\n\nExperience 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.\n\nBenefits and Perks:\nWork from (almost) anywhere for up to 20 days per year\n\nFocus on mental health and well-being:\nCompany-paid therapy sessions through SpringHealth\n\nCompany-paid subscription to HeadSpace\n\nCompany-wide week off a year - the whole team fully recharges (and returns without a pile-up of work!)\n\nNo meeting Fridays\n\nPaid parental leave\n\nPaid volunteer time\n\nFocus on your career growth:\nDevelopment Dollars\n\nLeadership development\n\nAccess to thousands of on-demand e-learnings\n\nTravel Discounts\n\nEmployee Resource Groups\n\n6 weeks paid vacation + a day off for your birthday\n\nFree lunch 2 days per week\n\nPension plan contributions\n\nPublic transportation subsidies\n\nBike leasing program\n\nMonthly social events, Thursday happy hours, sports teams\n\nAn awesome office in Friedrichshain, Berlin\n\nInclusion\nAt 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.\nNeed any adjustments for the interview, application or on the job? No problem - just give us a heads-up. We’ve got you.","description_format":"text","description_chars":3814,"description_truncated":false,"requirements":{"experience_years_min":6,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[{"language":"English","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":["Parental leave"],"hiring_locations":[{"name":"Germany","iso":"DE","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Price Comparison","Travel Technology"],"lifecycle":[{"event":"open","at":"2026-10-12T14:40:31Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":41,"reasons":["conf:3","win:early"],"computed_at":"2026-10-12T22:58:33Z"},"pay":null,"html_url":"https://alion.io/job/kayak-senior-software-engineer-k4b-2","json_url":"https://alion.io/job/kayak-senior-software-engineer-k4b-2.json","meta":{"generated_at":"2026-10-12T22:58:33Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":37684,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-13T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":3573},"rest":"https://alion.io/mcp/rest/get_company?id=3573"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fkayak-senior-software-engineer-k4b-2"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fkayak-senior-software-engineer-k4b-2"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fkayak-senior-software-engineer-k4b-2"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/kayak-senior-software-engineer-k4b-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fkayak-senior-software-engineer-k4b-2"}]}