Senior Full-Stack Engineer — Lead Personalization at Scale

Klaviyo Inc. in Boston is seeking a Senior Software Engineer for the Customer Hub to lead end-to-end product initiatives. You will develop scalable front-end and back-end solutions, drive architecture decisions, and mentor teammates.

You’ll work in a fast-paced, data-driven environment, emphasizing reliability, performance, and measurable impact. The role offers significant ownership, collaboration across disciplines, and opportunities to influence how ecommerce brands personalize the shopper