Senior Full-Stack Engineer: Personalization & Impact

Klaviyo Inc.; Boston (MA); Hybrid; USD 148,000 - 222,000; Full time

Job summary

Klaviyo is seeking a Senior Software Engineer for the Customer Hub to lead end-to-end development, shaping product outcomes with frontend and backend expertise. You will mentor peers, drive technical decisions, and deliver reliable, high-quality software across rapidly moving, cross-functional teams.

The role emphasizes ownership, speed, and measurable impact as Klaviyo expands its ecommerce personalization offerings, with a base pay range reflecting market norms across US locations.

Qualifications

• Proven track record of building high-quality products and systems.
• 5+ years experience in a software engineering role.
• Experience with end-to-end software solutions or both front-end and back-end technologies.
• Experience with React and related technologies.
• Experience leading projects and being accountable for outcomes.
• Experience mentoring team members or driving skill development.
• Experience conducting code reviews and robust testing.
• Experience in agile, fast-paced environments.
• Experience using AI effectively in software development and delivery.

Skills

5+ years exp

React experience

End-to-end dev

Mentoring

Code reviews

Agile environment

AI in dev

Project leadership

Tools

AWS

Python

Django

TypeScript

Job description

Klaviyo is seeking a Senior Software Engineer for the Customer Hub to lead end-to-end development, shaping product outcomes with frontend and backend expertise. You will mentor peers, drive technical decisions, and deliver reliable, high-quality software across rapidly moving, cross-functional teams.

The role emphasizes ownership, speed, and measurable impact as Klaviyo expands its ecommerce personalization offerings, with a base pay range reflecting market norms across US locations.