Software Development Engineer III, Advertising Technology

Software Development Engineer III, Advertising Technology Expedia Group Advertising builds the platforms and experiences that connect advertisers with millions of travelers across the globe. Our mission is to help partners reach the right traveler with the right message at the right time—through intuitive advertiser experiences, high-performance ad delivery systems, and intelligent, AI‑powered optimization. Introduction to the team We’re seeking a Software Development Engineer III to join our Advertising Technology team. You’ll build and operate real‑time ad delivery systems that power ad ranking, auctions, bidding, and budget enforcement at scale. These services sit on the critical path of ad delivery, where low latency, correctness, and reliability directly impact revenue, advertiser ROI, and traveler experience. You’ll work with Product, Machine Learning, Data Science, and Platform teams to integrate with APIs and microservices, bring ML‑driven signals into high‑throughput backend services, and scale the platform as the business grows. In this role, you will: Optimize bidding, ranking and pacing for guaranteed and non‑guaranteed ad delivery to surface more relevant ads and expand advertiser reach to travelers. Build and scale systems that support ad serving and ad selection across Expedia Group’s advertising network. Apply strong software design principles, algorithms, and data structures to build scalable, low‑latency, high‑throughput services. Work closely with Product, ML data scientists, and data teams on features such as relevance optimization, targeting, and performance modeling. Advocate for high‑quality code, automated testing, and strong observability practices. Participate in operational reviews and drive continuous improvement. Mentor junior engineers, lead design discussions, and help elevate the technical bar of the team. Minimum Qualifications: Bachelor’s or Master’s degree in Computer Science or a related technical field. 5+ years of experience in backend software development. Experience working with data‑driven systems, ML‑powered features, or A/B experimentation platforms. Strong proficiency in at least one modern programming language (e.g., Java, Kotlin). Experience building and deploying backend APIs (e.g., gRPC) and streaming or batch data processing services (e.g., Flink, Spark) in cloud environments. Solid understanding of distributed systems, data flows, and operational best practices. Preferred Qualifications: Experience with search and retrieval systems, including relevance ranking, vector databases, embeddings, or AI/semantic search. Experience designing and implementing agent‑to‑agent (A2A) and multi‑agent AI systems. Background in ads, marketplaces, e‑commerce, or travel platforms. The total cash range for this position in Chicago is $136,000 to $190,500. Employees in this role have the potential to increase their pay up to $217,500. The total cash range for this position in Seattle is $146,000 to $204,500, with potential to increase to $233,500. We provide a full benefits package, including travel perks, generous time‑off, parental leave, a flexible work model, and career development resources to fuel our employees’ passion for travel. Accommodation requests: If you need assistance with any part of the application or recruiting process due to a disability or other health condition, please reach out to our Recruiting Accommodations Team through the Accommodation Request. Expedia Group is committed to creating an inclusive work environment with a diverse workforce. 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. #J-18808-Ljbffr Traveltechessentialist