Principal Software Development Engineer
Introduction to the 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.
About the role
Lead the architecture and delivery of real-time, AI-powered fraud and abuse defenses on a global scale. You will design cloud-native decisioning and automated remediation systems, simplify our platform, and align cross-functional teams to measurable outcomes.
- Own end-to-end architecture for low-latency risk decisioning (signals + rules + models) and automated remediation
- Build, deploy, and operate ML in production; partner closely with DS/ML on features, experimentation, and monitoring
- Simplify and modernize the platform (streaming/data pipelines, microservices, CI/CD, configuration-driven controls) to speed safe iteration
- Drive build-vs-buy evaluations and benchmark vendors against in-house solutions for performance, cost, and risk posture
- Establish clear SLOs, observability, and safety/rollback mechanisms; ensure security, privacy, and compliance are built in
- Mentor senior engineers and align Product, Ops, Security, and Compliance on roadmap and outcomes
- Communicate clearly with executives and engineering: distill strategy, make tradeoffs explicit, and document decisions
Responsibilities
- Own end-to-end architecture for low-latency risk decisioning (signals + rules + models) and automated remediation
- Build, deploy, and operate ML in production; partner closely with DS/ML on features, experimentation, and monitoring
- Simplify and modernize the platform (streaming/data pipelines, microservices, CI/CD, configuration-driven controls) to speed safe iteration
- Drive build-vs-buy evaluations and benchmark vendors against in-house solutions for performance, cost, and risk posture
- Establish clear SLOs, observability, and safety/rollback mechanisms; ensure security, privacy, and compliance are built in
- Mentor senior engineers and align Product, Ops, Security, and Compliance on roadmap and outcomes
- Communicate clearly with executives and engineering: distill strategy, make tradeoffs explicit, and document decisions
Requirements
- 10+ years of software engineering, including 4+ years leading architecture for real-time, high-scale systems
- Proven experience building and operating fraud/risk systems in production (e.g., booking, payments/chargebacks, ATO, content/supplier integrity), with measurable impact on losses, false positives, and manual effort
- Production ML experience (supervised/anomaly detection, feature pipelines, online inference, monitoring/retraining); ability to ship with DS/ML partners
- Cloud-native engineering at scale (AWS, GCP, or Azure): event-driven services, data/stream processing, observability, cost and reliability best practices
- Strong coding skills in one or more of Java/Scala/Go/Python; microservices, APIs, and infrastructure-as-code
- Security, privacy, and regulatory fundamentals for sensitive data and risk decisioning
- Experience with executive communication: can brief executives, translate strategy into actionable engineering plans, and align teams
Preferred Qualifications
- LLM/agentic techniques applied to fraud (e.g., investigation assist, pattern discovery, automated playbooks) and retrieval over enterprise data
- Graph/sequence modeling or entity resolution at scale; device and behavioral signals
- Track record reducing manual operations via automation and platform simplification
- Deep cloud cost/performance tuning and capacity planning
- Marketplace, travel, or e-commerce experience
Pay Range: $231,000.00 to $323,500.00
Benefits and Perks: Expedia Group offers benefits and perks designed to support employees and their families, including medical, dental, and vision coverage, paid time off, an Employee Assistance Program, wellness and travel reimbursement, travel discounts, and International Airlines Travel Agent Network (IATAN) membership.