Senior Full Stack Engineer

Senior Full Stack Engineer Location : Kaunas, In office 2 days per week With millions of diners, 70,000+ restaurant partners and 25+ years of experience, OpenTable, part of Booking Holdings, Inc. (NASDAQ: BKNG), is an industry leader with a passion for helping restaurants thrive. Our world-class technology empowers restaurants to focus on what matters most – their team, their guests, and their bottom line – while enabling diners to discover and book the perfect restaurant for every occasion. Every employee at OpenTable has a tangible impact on what we do and how we do it. You’ll also be part of a global team and its portfolio of metasearch brands. Hospitality is all about taking care of others, and it defines our culture. About the Job Our Diner Growth - AdTech team owns the systems that carry conversion and revenue signals from OpenTable’s diner experiences to marketing partners. We work closely with our marketing partners to enable a wide range of Marketing technology, from attribution, email, CRM and analytics. We’re a distributed team, and this hybrid role is based in Kaunas, Lithuania, with two days in the office each week. We’re improving how campaign, consent, booking, and revenue data move from the diner journey through web applications, backend services, and data pipelines. We partner closely with product, commercial, marketing, and engineering teams to make those signals accurate, timely, and privacy-aware. As a Senior Full Stack Engineer, you’ll help evolve our consumer web tracking and conversion event service, build new partner integrations, and work in related reservation systems when needed to close data gaps and improve reliability and scale. Responsibilities • Build consent-aware tracking across web booking journeys, preserving campaign identifiers and conversion data from entry points through reservation confirmation. • Extend the conversion event service to process booking events and deliver reliable, partner-specific conversion and revenue signals. • Build or improve integrations with external partners as priorities evolve, such as Sojern, Amadeus, Meta, Google, TikTok, Snapchat, and Reddit. • Trace and improve data flows across frontend systems, backend services, and data pipelines to ensure attribution, reservation status, and revenue remain accurate throughout partner delivery. • Work in related services, including reservation systems, when changes are needed to close data gaps for measurement. • Partner with product, commercial, marketing, and engineering teams to define measurement needs, test end-to-end behaviour, and monitor data quality and delivery in production. Minimum Qualifications • At least five years of full-stack software engineering experience. • Ability to develop and maintain backend services written in Java and TypeScript. • Experience building user-facing applications with React. • Working knowledge of GraphQL microservices. • Experience integrating external services through their APIs and SDKs. Preferred Qualifications • Experience with paid media measurement, conversion tracking, or marketing attribution. • Experience with event-driven services and data pipelines. • Familiarity with privacy-aware tracking and consent signals. • Experience ensuring data quality or debugging reliability issues across multiple services. Benefits and Perks • Generous paid vacation + time off for your birthday: • 20 days of paid vacation • Enhanced paid parental leave • Health and life insurance coverage through Compensa • 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 • Annual company-wide week off a year - the whole team fully recha