Senior Software Development Engineer

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.

To shape the future of travel, people must come first. Guided by our Values and Leadership Agreements, we foster an open culture where everyone belongs, differences are celebrated and we know that when one of us wins, we all win. We provide a full benefits package, including exciting travel perks, generous time‑off, parental leave, a flexible work model (with some pretty cool offices), and career development resources, all to fuel our employees' passion for travel and ensure a rewarding career journey.

We’re building a more open world. Join us.

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

The Senior Software Engineer role sits within the Universal Messaging Platform (UMP) team—Expedia Group’s core communications platform. UMP powers high‑scale, reliable delivery across Email, SMS, Push, Inbox, and emerging channels, enabling timely, trusted engagement with millions of travelers worldwide.

As a Senior Software Engineer on the Inbox Experience team, you will lead the architecture, development, and operation of mission‑critical systems that elevate traveler experience, strengthen loyalty, and drive business growth at global scale.

• Design, build, and evolve scalable, reliable services and components, including system design, low‑level design, API design, and data modeling to support high‑traffic, customer‑facing and platform experiences.
• Write, review, and maintain high‑quality, well‑tested code, driving engineering best practices in code quality, security, observability, and performance across the team.
• Take end‑to‑end ownership of complex features or services, from technical design through implementation, deployment, monitoring, and iterative improvement in production.
• Collaborate closely with product, design, and cross‑functional engineering teams to break down ambiguous business problems into clear technical solutions that can be reused across multiple domains.
• 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 technical direction by participating in design reviews, proposing improvements to architecture and operational processes, and mentoring other engineers to raise the overall technical bar.

• Bachelor’s degree in Computer Science or a related technical field; or Equivalent related professional experience.
• 8+ years of relevant professional experience.
• Proven experience owning services or components through the full software development lifecycle, including design, implementation, deployment, and on‑call or operational support.
• Proficiency in at least one modern programming language and associated frameworks, with strong understanding of system design, API design, and data modeling concepts.
• Expert proficiency in Java, Kotlin, Graph
  
  QL, gRPC, Spring Boot.
• Strong experience building distributed systems, RESTful APIs, and microservices.
• Experience with cloud platforms (AWS, GCP, or Azure) and containerization technologies (Docker, Kubernetes).
• Familiarity with CI/CD pipelines, infrastructure code, and Dev Ops practices.
• Experience working on systems that integrate with multiple services or domains, ensuring reliability, scalability, and effective observability.

• Experience designing and evolving service or multi‑service architectures at scale, including patterns for resiliency, fault tolerance, and performance optimization.
• Track record of leading technical…