Software Development Engineer III, Advertising Technology

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.

- 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

- Bachelor's or Master's degree in Computer Science or a related technical field

- 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

- 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

Please note that this role is only available in Seattle, WA, in alignment with our flexible work model, which requires employees to be in the office at least three days a week. We are unable to offer relocation assistance for this role.

The total cash range for this position in Seattle is $146,000.00 to $204,500.00. Employees in this role have the potential to increase their pay up to $233,500.00, which is the top of the range, based on ongoing, demonstrated, and sustained performance in the role. The total cash range for this position in Chicago is $136,000.00 to $190,500.00.

Employees in this role have the potential to increase their pay up to $217,500.00, which is the top of the range, based on ongoing, demonstrated, and sustained performance in the role.