Software Development Engineer II - Identity Authentication Services

Expedia•Austin, TX

5d•$119,000 - $166,500

About The Position

Expedia Group is a global travel company that connects travelers, partners, and advertisers through its consumer brands, B2B network, and travel advertising business. The Technology Team partners with various departments to create innovative products, services, and tools for high-quality traveler, partner, and employee experiences. The Identity Authentication Services team specifically focuses on developing and owning the backend authentication APIs and services used across all Expedia Group brands. These services are critical for secure and seamless authentication at scale for travelers and partners. As a Software Development Engineer II on this team, you will contribute to building and evolving scalable features while ensuring the high availability, reliability, and low latency of this high-traffic platform.

Requirements

Bachelor’s degree in Computer Science or a related technical field; or Equivalent related professional experience.
2+ years of relevant professional experience.
Professional software development experience working on backend or distributed services, including ownership of at least one production service or component.
Proficiency in at least one modern programming language and experience with service-oriented architecture, including API design, data modeling, and low-level system design.
Experience building, integrating, or maintaining authentication, authorization, or identity-related capabilities such as login, tokens, or session management in a production environment.

Nice To Haves

Experience designing and operating highly available authentication or identity services at scale, including performance optimization, caching strategies, and resiliency patterns.
Hands-on experience with modern identity and access management standards or systems (for example, OAuth, OpenID Connect, SAML, or similar) and their integration into large applications.
Demonstrated ability to drive improvements in service reliability, security, and observability, including use of metrics, logs, and traces to make data-driven decisions.
Safely integrates and operates AI/ML‑enabled solutions that improve outcomes, for example by enhancing fraud detection, risk-based authentication, or anomaly detection in sign-in flows.
Experience applying AI-assisted development or analysis tools (such as code generation, static analysis, or traffic anomaly detection) to improve the quality and security of authentication services, including opportunities to incorporate AI into developer workflows.

Responsibilities

Design, develop, and maintain authentication and authorization services that are reliable, secure, and performant for large-scale customer and partner-facing applications.
Implement APIs, data models, and low-level designs that support identity, session management, and policy enforcement workflows across multiple products and platforms.
Collaborate with product, security, and engineering teams to translate authentication and access control requirements into technical solutions and deliver features end to end.
Own the quality, observability, and support for the services you build, including automated testing, monitoring, logging, and on-call participation for production systems.
Apply secure coding practices, threat-aware design, and familiarity with AI-driven systems, tools, or workflows and applying AI/ML concepts to real world products to continually strengthen authentication capabilities.
Contribute to technical documentation, code reviews, and knowledge sharing to enable fungibility across services and domains related to identity and access management.