Location
London, City of

Hours
Full Time

Salary
Competitive, commensurate with experience

About the Role
At Expedia Group, we help travelers explore the world, one journey at a time. As a global travel company powered by passionate people, trusted partnerships, and leading technology, we connect travelers, partners, and advertisers through our consumer brands, B2B network, and travel advertising business. Here, you'll do meaningful work that helps millions of people discover, book, and experience travel with more ease, confidence, and joy. Our five Behaviors - Traveler First, Think Big, Operate with Excellence, Ownership Mindset, and Succeed Together - foster a supportive environment where people can grow their careers and have the flexibility, benefits, and support to do their best work. Join us and build for travelers everywhere.

Our Technology Team partners with teams across Expedia Group to create innovative products, services, and tools to deliver high-quality experiences for travelers, partners, and employees. A singular technology platform powered by data and machine learning provides secure, differentiated, and personalized experiences that drive loyalty and traveler satisfaction.

This Principal Android Engineer role sits within the Search and Recommendations Experience team which owns the end-to-end search and recommendations experience, including search entry, results, maps, filters, and recommendations across multiple lines of business such as lodging, cars, activities, flights, and packages. In this role, you will provide technical leadership for native search and discovery experiences, setting architectural direction, influencing engineering standards, and shaping the evolution of AI-enabled capabilities across the mobile platform.

Key responsibilities include architecting, designing, and delivering advanced Android mobile solutions ensuring scalability, performance, and maintainability across Expedia Group's travel platforms. You will lead technical direction for multi-service and cross-domain initiatives, influence architectural decisions, and set coding standards. You will develop system designs, low-level designs (LLD), robust APIs, and data models that support seamless integration with internal and external services. Mentoring and guiding mobile engineers across teams to foster technical excellence, code quality, and knowledge sharing is essential. You will safely integrate and operate AI/ML-enabled solutions that improve mobile user experiences and business outcomes. Collaboration with product, design, and engineering stakeholders to deliver innovative mobile features and drive technical strategy across the organization is a key part of this role.

Experience
12+ years of relevant professional experience in software engineering.
Proven expertise in designing and delivering complex Android mobile applications at scale, including system and API design.
Extensive experience leading architecture and technical direction for multi-service, cross-domain, or organizational mobile initiatives.
Familiarity with AI-driven systems, tools, or workflows and applying AI/ML concepts to real-world products.

About you
Strong proficiency in Kotlin.
Advanced proficiency with Jetpack components/Jetpack Compose, Android UI/UX best practices, and performance optimization.
Deep understanding of Android app architecture patterns (e.g., MVVM, MVI, MVP).
Prior experience in the search domain or travel industry, such as building or scaling search and discovery in consumer mobile apps.
Experience establishing technical strategy, best practices, and operational excellence for organizational mobile platforms.
Advanced knowledge of integrating AI/ML capabilities into mobile products to enhance functionality and user engagement.
Demonstrated experience collaborating within large, globally dispersed development teams.
Expertise in cross-platform or multi-domain engineering, contributing to broad technical initiatives.

Qualifications
Bachelor's degree in Computer Science or a related technical field; or equivalent related professional experience.