Senior Software Engineer, Backend

About Engine Engine is the AI-native platform for intelligent travel. For a decade, Engine has built the proprietary technology and supply behind modern business travel, serving over 40,000 customers and nearly 2 million travelers, along with leading travel and AI companies that build on Engine's infrastructure. One system powers business travel, group travel, human agents, and AI agents. That work has earned recognition as one of Fast Company's Best Workplaces for Innovators (2025), TravelTech's Reservation Platform of the Year (2026), and one of Built In's Best Places to Work (2020–2026). We're looking for bold, ambitious people to help redefine how businesses manage and experience travel. Working here, you can expect exponential growth, an ambitious pace, full ownership, and high-caliber colleagues who push you to do the best work of your career. Every hire raises the bar. Come outpace the ordinary and build the future of travel with us. We are hiring for Senior Software Engineers, Backend, on multiple teams across our organization. Your application will be considered for any open positions that are a fit. Below the details of the role there is a short description of each team with an opening. Your Mission As a Senior Software Engineer at Engine, you’ll play a vital role in an environment where innovation meets collaboration. Here’s what you’ll take charge of: • Design and Implement: Craft innovative software systems and APIs that contribute to the success of Engine’s mission, focusing on scalability, security, and performance. • Collaboration: Collaborate with cross-functional teams, including Product and Data Science, to unlock new opportunities and deliver seamless experiences for our customers. • Ownership: Lead key initiatives that improve efficiency, enhance system performance, and drive customer satisfaction. What You’ll Bring to Engine We’re looking for someone who’s ready to make an impact and grow alongside us: • Experience: 5+ years of hands-on experience in designing, implementing, and maintaining highly available and high-performing distributed systems. You have a proven track record of building public-facing (consumer-grade) APIs and managing the complexities of versioning, deprecation, and consumption-based rate limiting. Experience with Node.js, TypeScript, Kotlin (or similar modern backend languages), and AWS is a plus. • Skills: You’re a problem-solver with a strong grasp of software design principles, scalability, and system architecture. You thrive in fast-paced, innovative environments and prioritize Domain-Driven Design. • Mindset: You’re ready to roll up your sleeves, collaborate, and deliver results that matter. Pricing Team The Pricing team builds the real-time systems that determine what every customer pays across our travel marketplace. We design and operate auction-based pricing engines, models informed by Machine Learning, and customer segmentation strategies — all running at scale across Lodging, Car Rentals, and Flights. Our work directly impacts conversion, revenue, and competitiveness, and the results are immediately measurable. IDM Team The Identity Management team owns authentication and authorization for Hotel Engine's customers. We operate the Auth0 tenant, shape the login experience, and partner with enterprise customers to deliver secure, reliable identity integrations — so every traveler, admin, and partner can access the right things, at the right time, with confidence. Compensation Our compensation packages are based on several factors, including your experience, expertise, and location. In addition to a competitive base salary, all roles receive equity. Depending on the role, total compensation may also include an annual bonus. Your recruiter will share your complete