Software Development Engineer III

Full Stack Software Development Engineer III – EG Advertising

As a Full Stack Software Development Engineer III on EG Advertising, you will work on a platform that sits at the center of Expedia Group’s advertising growth strategy. You will help power the next phase of that growth by building scalable, low‑latency systems and intelligent ad experiences that expand inventory, improve relevance, and help EG Advertising achieve ambitious revenue goals across onsite, partner, and off‑platform channels.

• Design, implement, and maintain robust, secure, and scalable services and applications, including system design (LLD), API design, and data modeling to support business‑critical capabilities across multiple domains.
• Write clean, reliable, and well‑tested code, applying sound engineering principles, design patterns, and code review practices to improve quality, performance, and maintainability for complex systems.
• Own end‑to‑end delivery of features and services, from technical design and implementation through deployment, monitoring, and iteration, ensuring high availability and operational excellence.
• Diagnose and resolve complex production issues, perform root cause analysis, and drive long‑term improvements in reliability, observability, and resilience across services and dependencies.
• Collaborate with cross‑functional partners, contributing technical expertise to product discovery, backlog prioritization, and data‑driven decision making while ensuring solutions are reusable and fungible 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.

• Bachelor’s degree in Computer Science or a related technical field; or equivalent related professional experience.
• 5+ years of relevant professional experience.
• Professional software development experience building and maintaining services or applications, with ownership of features or services in production environments.
• Proficiency in at least one modern programming language and core computer science fundamentals (data structures, algorithms, design, and problem solving).
• Experience with system design (LLD), API design, and data modeling.
• Experience owning the full software development lifecycle for services or applications, including design, implementation, code reviews, testing, deployment, and monitoring.

• Proficiency with Kotlin or other JVM‑based languages (for example, Java), with experience building scalable, production‑grade backend systems using microservices and event‑driven architectures.
• Experience building or operating ad servers, ad bidders, ad selection or ranking systems, campaign delivery systems, or other ad tech / programmatic advertising platforms, or similarly complex recommendation or ML‑driven decisioning systems at scale.
• Experience designing and operating high‑throughput, low‑latency distributed services in production, with strong focus on observability, reliability, and performance optimization.
• Hands‑on experience with AWS, ideally including serverless patterns and infrastructure‑as‑code tools such as Cloud Formation.
• Experience with modern software delivery practices, including containerized deployments (for example, Docker and Kubernetes), CI/CD pipelines, and test automation.
• Demonstrated ability to collaborate with Data Scientists and apply AI/ML in real‑world systems, including integrating models into production services or developing new data‑driven features that improve relevance, personalization, or operational outcomes.
• Strong communication and collaboration skills, including experience mentoring junior engineers, leading small technical projects, and influencing technical decisions and engineering best practices within a team.

The total cash range for this position in Seattle is $ to $. Employees in this role have the potential to increase their pay up to $, which is the top of the range, based on ongoing, demonstrated, and sustained performance in the role. Starting pay for this role will vary based on multiple factors, including location, available budget, and an individual’s knowledge, skills, and experience.

Pay ranges may be modified in the future.

All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, veteran status, or any other characteristic protected by law. This employer participates in E‑Verify. The employer will provide the Social Security Administration (SSA) and, if necessary, the Department of Homeland Security (DHS) with information from each new employee’s I‑9 to confirm work authorization.