Software Development Engineer II - Back End, Loyalty

Expedia•Seattle, WA

37d•Hybrid

About The Position

Expedia Group brands power global travel for everyone, everywhere. We design cutting-edge tech to make travel smoother and more memorable, and we create groundbreaking solutions for our partners. Our diverse, vibrant, and welcoming community is essential in driving our success. The Loyalty Engineering organization powers continuous engagement, re-engagement, and re-acquisition for travelers worldwide. We build the systems that create a durable growth flywheel for Expedia, deepening traveler relationships while driving measurable business impact across brands and markets. In this role, you will contribute to the development for the platform services powering Loyalty systems, B2B partners and Co-Branded credit card systems.

Requirements

Bachelor’s degree in Computer Science or a related technical field; or Equivalent related professional experience.
2+ years of relevant professional experience.
Professional experience as a backend or server-side Software Development Engineer building and operating services or APIs, with ownership of one or more production services or components.
Proficiency in at least one modern programming language used for backend development and familiarity with system design (including low-level design), API design, and data modeling.
Experience developing and integrating backend services within a distributed or service-oriented architecture, including using data stores and messaging or integration patterns relevant to service-based systems.

Nice To Haves

Experience designing and evolving service contracts, low-level designs, and data models for complex, high-traffic systems using Java.
Background working in backend services and data models in a complex business domain such as loyalty, rewards, or customer accounts, with an emphasis on scalability and maintainability.
Track record of improving service reliability and operability through monitoring, alerting, logging, and performance optimization for backend systems running at scale.
Demonstrated ability to influence technical direction within a team, including proposing and implementing improvements to service design, coding standards, and integration patterns.
Familiarity with AI-driven systems, tools, or workflows as applied to backend services, and experience safely integrating AI/ML‑enabled capabilities (such as recommendations or personalization) into customer-facing products.
Experience applying AI/ML concepts within backend architectures, such as integrating model inference services, experimentation frameworks, or data pipelines that enhance loyalty features and customer outcomes.

Responsibilities

Design, develop, and maintain backend services and APIs that power Expedia Group’s Loyalty experiences, ensuring reliability, scalability, and high performance.
Implement robust data models and low-level designs that support loyalty use cases such as member accounts, benefits, earning/redemption, and personalization across multiple products.
Collaborate with product managers, architects, and other engineers to decompose complex loyalty domain problems into well-defined, testable backend solutions.
Apply secure coding practices, instrumentation, and monitoring to improve service observability, operational excellence, and incident response for loyalty systems.
Safely integrate and operate AI/ML‑enabled solutions that improve outcomes, including familiarity with AI-driven systems, tools, or workflows and applying AI/ML concepts to real world products.
Contribute to code reviews, technical documentation, and cross-team initiatives that improve backend engineering standards and enable reuse of loyalty capabilities across domains.