Principal Software Development Engineer (Full Stack) - Marketing Technology

Expedia Group • Seattle, WA

4d • $231,000 - $323,500

About The Position

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 know that when one of us wins, we all win. We provide a full benefits package, including exciting travel perks, generous time-off, parental leave, a flexible work model (with some pretty cool offices), and career development resources, all to fuel our employees' passion for travel and ensure a rewarding career journey. We’re building a more open world. Join us. We create and deliver an aligned, dedicated marketing strategy to fuel each Expedia Group brand's success. Since our travelers interact with us through our brands, we have a brand focus in our marketing, while leveraging the scale and efficiency we’ve built in functional expertise. Introduction to the Team At Expedia Group, we’re reinventing the future of marketing technology. Our Marketing Technology platform powers global marketing at scale across Google, Meta, Apple, and beyond. As a Principal Software Engineer, you’ll set the technical vision and build the foundational systems that harness AI, automation, and large-scale distributed systems to transform how marketing is executed. Expedia Group is at the intersection of travel, technology, and AI. Our team’s mission is to design best-in-class marketing platforms that deliver measurable business impact while pushing the boundaries of what’s possible. We operate like a startup inside a global company by moving fast, experimenting boldly, and building for scale. Technologies we work with include Golang, Python, Kotlin, React, Kubernetes, Argo, and AWS (EC2, ECS, EMR, RDS, S3). We are not just optimizing ads. We are building context-aware, AI-driven agentic workflows that preserve brand integrity while supercharging creativity and productivity. Think dynamic asset generation, automated content moderation, and intelligent bidding at global scale. If you thrive on solving complex problems at massive scale, shaping platform strategy, and mentoring world-class engineers, this is the place for you.

Requirements

• 12+ years of experience with Bachelor’s, 10+ years with Master’s, in software engineering or architecture including leading design of large-scale distributed systems.
• Proven ability to design and evolve complex systems for scalability, reliability, and security
• Strong experience with Kubernetes, AWS, and modern infrastructure practices.
• Proficiency in multiple programming languages (Java, Python, Scala, Kotlin, or equivalent).
• Familiarity with applying AI/ML in production systems, or eagerness to rapidly learn and apply.
• Track record of mentoring engineers, driving consensus across diverse teams, and communicating technical vision to executives.
• Relentless focus on solving real problems, delivering measurable outcomes, and raising the bar.

Nice To Haves

• Experience with front-end frameworks (React etc) is a plus.
• Proficiency in utilizing Vibe coding tools to maximise productivity.

Responsibilities

• Shape the future of marketing tech: Architect and deliver core systems that enable AI-driven marketing workflows at global scale.
• Drive technical strategy: Partner with engineering, data science, and product leaders to define the platform roadmap and long-term architecture.
• Lead by example: Write, review, and guide development of high-quality, reliable, and scalable software.
• Mentor and elevate: Coach engineers across multiple teams, fostering technical excellence and a culture of innovation.
• Innovate with AI: Integrate generative AI and intelligent automation into workflows that directly reduce external spend and amplify marketing impact.
• Scale for reliability: Ensure our systems are secure, resilient, observable, and performant under the demands of billions of transactions.
• Collaborate across Expedia Group: Influence and align with cross-functional stakeholders - from marketing to ML science — to deliver measurable value to Expedia Group brands.

Benefits

• full benefits package, including exciting travel perks, generous time-off, parental leave, a flexible work model (with some pretty cool offices), and career development resources
• medical/dental/vision
• paid time off
• Employee Assistance Program
• wellness & travel reimbursement
• travel discounts
• International Airlines Travel Agent (IATAN) membership

What This Job Offers

• Job Type: Full-time
• Career Level: Principal
• Number of Employees: 5,001-10,000 employees