Software Development Engineer II, Advertising Technology

Our Mission 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. Why Join Us? 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 when one of us wins, we all win. Our Technology Team Our Technology Team partners with teams across Expedia Group 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. Our Team We are the Expedia Group Advertising team. As a global leader in travel industry advertising, we connect advertisers with millions of travelers. This is a rapidly growing area of the business, with strong year‑over‑year growth, and a key area of long‑term investment. Role Overview Within this organization, you’ll join the Advertiser Team, which owns the advertiser‑facing portal and the backend services and APIs that power it. These systems enable advertisers and third‑party partners to configure, manage, and optimize ad campaigns across Expedia Group platforms. The Role As a Software Development Engineer II, you will play a critical role in building and scaling high‑performance systems that support Expedia Group’s expanding advertising network. This role is primarily backend‑focused (approximately 70–80%), with some frontend development (20–30%) supporting customer‑facing experiences built in React. You will contribute to a multi‑year initiative to design and evolve a unified advertising platform, consolidating multiple ad products into a single, scalable system. Your work will directly influence advertiser experiences and shared capabilities across the platform. In This Role, You Will Design, build, test, and maintain scalable backend services and APIs that power the advertiser portal and enable third‑party integrations Contribute to the development of a unified ads platform, delivering reusable capabilities across multiple advertising products Own features and services end‑to‑end—from design and implementation to deployment and operational support Apply strong coding fundamentals to deliver high‑quality, maintainable, and extensible solutions Participate in system design, low‑level design, API design (including GraphQL), and data modeling Build customer‑facing features (primarily backend‑driven, with some React frontend contributions) Drive improvements in scalability, performance, and reliability for high‑traffic advertiser systems Collaborate with engineering, product, operations, and globally distributed teams to translate business needs into technical solutions Troubleshoot production issues and improve system health through monitoring, debugging, automation, and observability practices Write secure, well‑tested code, participate in code reviews, and follow engineering best practices Leverage AI‑enabled solutions and AI‑assisted development tools to improve developer productivity and product outcomes Minimum Qualifications Bachelor’s degree in Computer Science, Engineering, or related technical field, or equivalent practical experience 3+ years of software development experience building and supporting production systems and services Strong foundation in data structures, algorithms, and core computer science fundamentals Experience owning components or services, including implementation, testing, deployment, and operational support Experience designing and building scalable backend systems and APIs Proficiency in one or more of the following: Java, Kotlin (or ability to ramp quickly), and familiarity with React Experience with API design and consumption, including REST and/or GraphQL Experience working across multiple technical systems or services, with the ability to debug and deliver maintainable solutions Preferred Qualifications Experience building software for advertising technology, marketplaces, or other high‑scale distributed systems Experience with event streaming or messaging systems (e.g., Flink, Kafka, or similar real‑time data processing technologies) Experience contributing to architecture and design discussions for services, APIs, and data models Demonstrated ability to improve service quality through performance tuning, observability, and automation Experience using metrics and data to inform engineering decisions and measure impact Familiarity with AI‑driven systems and/or AI‑assisted development tools (e.g., GitHub Copilot, Claude) Experience building customer‑facing features, including frontend development with React Background working on large‑scale, high‑throughput systems or platforms What You’ll Bring A strong sense of ownership, with a track record of delivering solutions end‑to‑end Ability to collaborate effectively across teams and contribute to a highly collaborative engineering culture Passion for building scalable, high‑performance systems and improving the developer and customer experience Interest in solving complex problems in a fast‑growing, high‑impact area of the business Location & Compensation This role is only available in Seattle, WA. Employees must 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 $119,000 to $166,500. Employees have the potential to increase their pay up to $190,500, based on ongoing, demonstrated, and sustained performance. Starting pay will vary based on location, budget, and individual experience. Benefits Expedia Group offers a full benefits package, including medical/dental/vision, paid time off, an Employee Assistance Program, wellness & travel reimbursement, travel discounts, and an International Airlines Travel Agent (IATAN) membership. Accommodations If you need assistance with any part of the application or recruiting process due to a disability or other condition, please reach out to our Recruiting Accommodations Team through the Accommodation Request. Equal Employment Opportunity Statement Expedia 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