FLEX Principal Engineer – Web Performance

As a Principal Engineer – Web Performance you will play a critical role in improving the speed, reliability, and stability of traveler facing web experiences across Marriott’s digital ecosystem, including homepage, search, and reservation flows. In this role, you will work across multiple product teams to establish performance standards, proactively identify performance regressions, and improve how teams measure and understand the real world impact of their changes. You will partner closely with engineers, product teams, and platform stakeholders to ensure performance is considered early and continuously throughout the development lifecycle. In addition to performance analysis and observability, you will contribute to the evolution of internal performance reporting applications built with Next.js and PostgreSQL, helping teams self serve historical trends, release comparisons, and cohort based performance insights. These tools are treated as internal products, with roadmaps, UX considerations, and a focus on long term maintainability. This role emphasizes technical leadership and influence without direct authority, enabling teams to build fast, resilient experiences while continuously raising the bar on performance engineering practices.