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Salary: USD 148,000 - 0 / annual
Klaviyo is seeking a Senior Full Stack Engineer to join the Customer Hub team, a fast-moving group pioneering personalization solutions for ecommerce brands. In this role, you'll lead key initiatives that enhance product offerings and drive company growth by developing innovative end-to-end solutions using both front-end and back-end technologies.
You'll tackle complex technical challenges, evaluate business and technical trade-offs, and determine the best paths forward. As a senior engineer, you'll act as a leader and mentor, driving key technology decisions while deploying well-designed, thoroughly tested solutions that ensure reliability and performance. The Customer Hub team is reinventing how ecommerce brands personalize the shopper journey—bringing personalization on-site, building unified account experiences across touchpoints, and delivering measurable conversion lift.
The team operates with an entrepreneurial, fast-moving culture that prioritizes simplicity, speed, and impact. Every team member is expected to take radical ownership, collaborate across disciplines, and push beyond traditional role boundaries. Success means delivering exceptional work that sets the standard for velocity and results company-wide while helping shape Klaviyo's future through experimentation and executional excellence.
Required qualifications include 5+ years of software engineering experience, strong full-stack capabilities with React and related technologies, proven ability to lead projects and mentor team members, experience with code reviews and robust testing practices, and comfort working in agile, fast-paced environments. You should also demonstrate effective use of AI tools in software development and delivery. Nice-to-have skills include Python/Django, TypeScript, digital marketing or customer data software experience, and cloud-native development with AWS.
